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/hippo/src/main/webapp/ext/src/util/Date.js

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   1/*!
   2 * Ext JS Library 3.0.0
   3 * Copyright(c) 2006-2009 Ext JS, LLC
   4 * licensing@extjs.com
   5 * http://www.extjs.com/license
   6 */
   7/**
   8 * @class Date
   9 *
  10 * The date parsing and formatting syntax contains a subset of
  11 * <a href="http://www.php.net/date">PHP's date() function</a>, and the formats that are
  12 * supported will provide results equivalent to their PHP versions.
  13 *
  14 * The following is a list of all currently supported formats:
  15 * <pre>
  16Format  Description                                                               Example returned values
  17------  -----------------------------------------------------------------------   -----------------------
  18  d     Day of the month, 2 digits with leading zeros                             01 to 31
  19  D     A short textual representation of the day of the week                     Mon to Sun
  20  j     Day of the month without leading zeros                                    1 to 31
  21  l     A full textual representation of the day of the week                      Sunday to Saturday
  22  N     ISO-8601 numeric representation of the day of the week                    1 (for Monday) through 7 (for Sunday)
  23  S     English ordinal suffix for the day of the month, 2 characters             st, nd, rd or th. Works well with j
  24  w     Numeric representation of the day of the week                             0 (for Sunday) to 6 (for Saturday)
  25  z     The day of the year (starting from 0)                                     0 to 364 (365 in leap years)
  26  W     ISO-8601 week number of year, weeks starting on Monday                    01 to 53
  27  F     A full textual representation of a month, such as January or March        January to December
  28  m     Numeric representation of a month, with leading zeros                     01 to 12
  29  M     A short textual representation of a month                                 Jan to Dec
  30  n     Numeric representation of a month, without leading zeros                  1 to 12
  31  t     Number of days in the given month                                         28 to 31
  32  L     Whether it's a leap year                                                  1 if it is a leap year, 0 otherwise.
  33  o     ISO-8601 year number (identical to (Y), but if the ISO week number (W)    Examples: 1998 or 2004
  34        belongs to the previous or next year, that year is used instead)
  35  Y     A full numeric representation of a year, 4 digits                         Examples: 1999 or 2003
  36  y     A two digit representation of a year                                      Examples: 99 or 03
  37  a     Lowercase Ante meridiem and Post meridiem                                 am or pm
  38  A     Uppercase Ante meridiem and Post meridiem                                 AM or PM
  39  g     12-hour format of an hour without leading zeros                           1 to 12
  40  G     24-hour format of an hour without leading zeros                           0 to 23
  41  h     12-hour format of an hour with leading zeros                              01 to 12
  42  H     24-hour format of an hour with leading zeros                              00 to 23
  43  i     Minutes, with leading zeros                                               00 to 59
  44  s     Seconds, with leading zeros                                               00 to 59
  45  u     Decimal fraction of a second                                              Examples:
  46        (minimum 1 digit, arbitrary number of digits allowed)                     001 (i.e. 0.001s) or
  47                                                                                  100 (i.e. 0.100s) or
  48                                                                                  999 (i.e. 0.999s) or
  49                                                                                  999876543210 (i.e. 0.999876543210s)
  50  O     Difference to Greenwich time (GMT) in hours and minutes                   Example: +1030
  51  P     Difference to Greenwich time (GMT) with colon between hours and minutes   Example: -08:00
  52  T     Timezone abbreviation of the machine running the code                     Examples: EST, MDT, PDT ...
  53  Z     Timezone offset in seconds (negative if west of UTC, positive if east)    -43200 to 50400
  54  c     ISO 8601 date
  55        Notes:                                                                    Examples:
  56        1) If unspecified, the month / day defaults to the current month / day,   1991 or
  57           the time defaults to midnight, while the timezone defaults to the      1992-10 or
  58           browser's timezone. If a time is specified, it must include both hours 1993-09-20 or
  59           and minutes. The "T" delimiter, seconds, milliseconds and timezone     1994-08-19T16:20+01:00 or
  60           are optional.                                                          1995-07-18T17:21:28-02:00 or
  61        2) The decimal fraction of a second, if specified, must contain at        1996-06-17T18:22:29.98765+03:00 or
  62           least 1 digit (there is no limit to the maximum number                 1997-05-16T19:23:30,12345-0400 or
  63           of digits allowed), and may be delimited by either a '.' or a ','      1998-04-15T20:24:31.2468Z or
  64        Refer to the examples on the right for the various levels of              1999-03-14T20:24:32Z or
  65        date-time granularity which are supported, or see                         2000-02-13T21:25:33
  66        http://www.w3.org/TR/NOTE-datetime for more info.                         2001-01-12 22:26:34
  67  U     Seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)                1193432466 or -2138434463
  68  M$    Microsoft AJAX serialized dates                                           \/Date(1238606590509)\/ (i.e. UTC milliseconds since epoch) or
  69                                                                                  \/Date(1238606590509+0800)\/
  70</pre>
  71 *
  72 * Example usage (note that you must escape format specifiers with '\\' to render them as character literals):
  73 * <pre><code>
  74// Sample date:
  75// 'Wed Jan 10 2007 15:05:01 GMT-0600 (Central Standard Time)'
  76
  77var dt = new Date('1/10/2007 03:05:01 PM GMT-0600');
  78document.write(dt.format('Y-m-d'));                           // 2007-01-10
  79document.write(dt.format('F j, Y, g:i a'));                   // January 10, 2007, 3:05 pm
  80document.write(dt.format('l, \\t\\he jS \\of F Y h:i:s A'));  // Wednesday, the 10th of January 2007 03:05:01 PM
  81</code></pre>
  82 *
  83 * Here are some standard date/time patterns that you might find helpful.  They
  84 * are not part of the source of Date.js, but to use them you can simply copy this
  85 * block of code into any script that is included after Date.js and they will also become
  86 * globally available on the Date object.  Feel free to add or remove patterns as needed in your code.
  87 * <pre><code>
  88Date.patterns = {
  89    ISO8601Long:"Y-m-d H:i:s",
  90    ISO8601Short:"Y-m-d",
  91    ShortDate: "n/j/Y",
  92    LongDate: "l, F d, Y",
  93    FullDateTime: "l, F d, Y g:i:s A",
  94    MonthDay: "F d",
  95    ShortTime: "g:i A",
  96    LongTime: "g:i:s A",
  97    SortableDateTime: "Y-m-d\\TH:i:s",
  98    UniversalSortableDateTime: "Y-m-d H:i:sO",
  99    YearMonth: "F, Y"
 100};
 101</code></pre>
 102 *
 103 * Example usage:
 104 * <pre><code>
 105var dt = new Date();
 106document.write(dt.format(Date.patterns.ShortDate));
 107</code></pre>
 108 * <p>Developer-written, custom formats may be used by supplying both a formatting and a parsing function
 109 * which perform to specialized requirements. The functions are stored in {@link #parseFunctions} and {@link #formatFunctions}.</p>
 110 */
 111
 112/*
 113 * Most of the date-formatting functions below are the excellent work of Baron Schwartz.
 114 * (see http://www.xaprb.com/blog/2005/12/12/javascript-closures-for-runtime-efficiency/)
 115 * They generate precompiled functions from format patterns instead of parsing and
 116 * processing each pattern every time a date is formatted. These functions are available
 117 * on every Date object.
 118 */
 119
 120(function() {
 121
 122/**
 123 * Global flag which determines if strict date parsing should be used.
 124 * Strict date parsing will not roll-over invalid dates, which is the
 125 * default behaviour of javascript Date objects.
 126 * (see {@link #parseDate} for more information)
 127 * Defaults to <tt>false</tt>.
 128 * @static
 129 * @type Boolean
 130*/
 131Date.useStrict = false;
 132
 133
 134// create private copy of Ext's String.format() method
 135// - to remove unnecessary dependency
 136// - to resolve namespace conflict with M$-Ajax's implementation
 137function xf(format) {
 138    var args = Array.prototype.slice.call(arguments, 1);
 139    return format.replace(/\{(\d+)\}/g, function(m, i) {
 140        return args[i];
 141    });
 142}
 143
 144
 145// private
 146Date.formatCodeToRegex = function(character, currentGroup) {
 147    // Note: currentGroup - position in regex result array (see notes for Date.parseCodes below)
 148    var p = Date.parseCodes[character];
 149
 150    if (p) {
 151      p = typeof p == 'function'? p() : p;
 152      Date.parseCodes[character] = p; // reassign function result to prevent repeated execution
 153    }
 154
 155    return p? Ext.applyIf({
 156      c: p.c? xf(p.c, currentGroup || "{0}") : p.c
 157    }, p) : {
 158        g:0,
 159        c:null,
 160        s:Ext.escapeRe(character) // treat unrecognised characters as literals
 161    }
 162}
 163
 164// private shorthand for Date.formatCodeToRegex since we'll be using it fairly often
 165var $f = Date.formatCodeToRegex;
 166
 167Ext.apply(Date, {
 168    /**
 169     * <p>An object hash in which each property is a date parsing function. The property name is the
 170     * format string which that function parses.</p>
 171     * <p>This object is automatically populated with date parsing functions as
 172     * date formats are requested for Ext standard formatting strings.</p>
 173     * <p>Custom parsing functions may be inserted into this object, keyed by a name which from then on
 174     * may be used as a format string to {@link #parseDate}.<p>
 175     * <p>Example:</p><pre><code>
 176Date.parseFunctions['x-date-format'] = myDateParser;
 177</code></pre>
 178     * <p>A parsing function should return a Date object, and is passed the following parameters:<div class="mdetail-params"><ul>
 179     * <li><code>date</code> : String<div class="sub-desc">The date string to parse.</div></li>
 180     * <li><code>strict</code> : Boolean<div class="sub-desc">True to validate date strings while parsing
 181     * (i.e. prevent javascript Date "rollover") (The default must be false).
 182     * Invalid date strings should return null when parsed.</div></li>
 183     * </ul></div></p>
 184     * <p>To enable Dates to also be <i>formatted</i> according to that format, a corresponding
 185     * formatting function must be placed into the {@link #formatFunctions} property.
 186     * @property parseFunctions
 187     * @static
 188     * @type Object
 189     */
 190    parseFunctions: {
 191        "M$": function(input, strict) {
 192            // note: the timezone offset is ignored since the M$ Ajax server sends
 193            // a UTC milliseconds-since-Unix-epoch value (negative values are allowed)
 194            var re = new RegExp('\\/Date\\(([-+])?(\\d+)(?:[+-]\\d{4})?\\)\\/');
 195            var r = (input || '').match(re);
 196            return r? new Date(((r[1] || '') + r[2]) * 1) : null;
 197        }
 198    },
 199    parseRegexes: [],
 200
 201    /**
 202     * <p>An object hash in which each property is a date formatting function. The property name is the
 203     * format string which corresponds to the produced formatted date string.</p>
 204     * <p>This object is automatically populated with date formatting functions as
 205     * date formats are requested for Ext standard formatting strings.</p>
 206     * <p>Custom formatting functions may be inserted into this object, keyed by a name which from then on
 207     * may be used as a format string to {@link #format}. Example:</p><pre><code>
 208Date.formatFunctions['x-date-format'] = myDateFormatter;
 209</code></pre>
 210     * <p>A formatting function should return a string repesentation of the passed Date object:<div class="mdetail-params"><ul>
 211     * <li><code>date</code> : Date<div class="sub-desc">The Date to format.</div></li>
 212     * </ul></div></p>
 213     * <p>To enable date strings to also be <i>parsed</i> according to that format, a corresponding
 214     * parsing function must be placed into the {@link #parseFunctions} property.
 215     * @property formatFunctions
 216     * @static
 217     * @type Object
 218     */
 219    formatFunctions: {
 220        "M$": function() {
 221            // UTC milliseconds since Unix epoch (M$-AJAX serialized date format (MRSF))
 222            return '\\/Date(' + this.getTime() + ')\\/';
 223        }
 224    },
 225
 226    y2kYear : 50,
 227
 228    /**
 229     * Date interval constant
 230     * @static
 231     * @type String
 232     */
 233    MILLI : "ms",
 234
 235    /**
 236     * Date interval constant
 237     * @static
 238     * @type String
 239     */
 240    SECOND : "s",
 241
 242    /**
 243     * Date interval constant
 244     * @static
 245     * @type String
 246     */
 247    MINUTE : "mi",
 248
 249    /** Date interval constant
 250     * @static
 251     * @type String
 252     */
 253    HOUR : "h",
 254
 255    /**
 256     * Date interval constant
 257     * @static
 258     * @type String
 259     */
 260    DAY : "d",
 261
 262    /**
 263     * Date interval constant
 264     * @static
 265     * @type String
 266     */
 267    MONTH : "mo",
 268
 269    /**
 270     * Date interval constant
 271     * @static
 272     * @type String
 273     */
 274    YEAR : "y",
 275
 276    /**
 277     * <p>An object hash containing default date values used during date parsing.</p>
 278     * <p>The following properties are available:<div class="mdetail-params"><ul>
 279     * <li><code>y</code> : Number<div class="sub-desc">The default year value. (defaults to undefined)</div></li>
 280     * <li><code>m</code> : Number<div class="sub-desc">The default 1-based month value. (defaults to undefined)</div></li>
 281     * <li><code>d</code> : Number<div class="sub-desc">The default day value. (defaults to undefined)</div></li>
 282     * <li><code>h</code> : Number<div class="sub-desc">The default hour value. (defaults to undefined)</div></li>
 283     * <li><code>i</code> : Number<div class="sub-desc">The default minute value. (defaults to undefined)</div></li>
 284     * <li><code>s</code> : Number<div class="sub-desc">The default second value. (defaults to undefined)</div></li>
 285     * <li><code>ms</code> : Number<div class="sub-desc">The default millisecond value. (defaults to undefined)</div></li>
 286     * </ul></div></p>
 287     * <p>Override these properties to customize the default date values used by the {@link #parseDate} method.</p>
 288     * <p><b>Note: In countries which experience Daylight Saving Time (i.e. DST), the <tt>h</tt>, <tt>i</tt>, <tt>s</tt>
 289     * and <tt>ms</tt> properties may coincide with the exact time in which DST takes effect.
 290     * It is the responsiblity of the developer to account for this.</b></p>
 291     * Example Usage:
 292     * <pre><code>
 293// set default day value to the first day of the month
 294Date.defaults.d = 1;
 295
 296// parse a February date string containing only year and month values.
 297// setting the default day value to 1 prevents weird date rollover issues
 298// when attempting to parse the following date string on, for example, March 31st 2009.
 299Date.parseDate('2009-02', 'Y-m'); // returns a Date object representing February 1st 2009
 300</code></pre>
 301     * @property defaults
 302     * @static
 303     * @type Object
 304     */
 305    defaults: {},
 306
 307    /**
 308     * An array of textual day names.
 309     * Override these values for international dates.
 310     * Example:
 311     * <pre><code>
 312Date.dayNames = [
 313    'SundayInYourLang',
 314    'MondayInYourLang',
 315    ...
 316];
 317</code></pre>
 318     * @type Array
 319     * @static
 320     */
 321    dayNames : [
 322        "Sunday",
 323        "Monday",
 324        "Tuesday",
 325        "Wednesday",
 326        "Thursday",
 327        "Friday",
 328        "Saturday"
 329    ],
 330
 331    /**
 332     * An array of textual month names.
 333     * Override these values for international dates.
 334     * Example:
 335     * <pre><code>
 336Date.monthNames = [
 337    'JanInYourLang',
 338    'FebInYourLang',
 339    ...
 340];
 341</code></pre>
 342     * @type Array
 343     * @static
 344     */
 345    monthNames : [
 346        "January",
 347        "February",
 348        "March",
 349        "April",
 350        "May",
 351        "June",
 352        "July",
 353        "August",
 354        "September",
 355        "October",
 356        "November",
 357        "December"
 358    ],
 359
 360    /**
 361     * An object hash of zero-based javascript month numbers (with short month names as keys. note: keys are case-sensitive).
 362     * Override these values for international dates.
 363     * Example:
 364     * <pre><code>
 365Date.monthNumbers = {
 366    'ShortJanNameInYourLang':0,
 367    'ShortFebNameInYourLang':1,
 368    ...
 369};
 370</code></pre>
 371     * @type Object
 372     * @static
 373     */
 374    monthNumbers : {
 375        Jan:0,
 376        Feb:1,
 377        Mar:2,
 378        Apr:3,
 379        May:4,
 380        Jun:5,
 381        Jul:6,
 382        Aug:7,
 383        Sep:8,
 384        Oct:9,
 385        Nov:10,
 386        Dec:11
 387    },
 388
 389    /**
 390     * Get the short month name for the given month number.
 391     * Override this function for international dates.
 392     * @param {Number} month A zero-based javascript month number.
 393     * @return {String} The short month name.
 394     * @static
 395     */
 396    getShortMonthName : function(month) {
 397        return Date.monthNames[month].substring(0, 3);
 398    },
 399
 400    /**
 401     * Get the short day name for the given day number.
 402     * Override this function for international dates.
 403     * @param {Number} day A zero-based javascript day number.
 404     * @return {String} The short day name.
 405     * @static
 406     */
 407    getShortDayName : function(day) {
 408        return Date.dayNames[day].substring(0, 3);
 409    },
 410
 411    /**
 412     * Get the zero-based javascript month number for the given short/full month name.
 413     * Override this function for international dates.
 414     * @param {String} name The short/full month name.
 415     * @return {Number} The zero-based javascript month number.
 416     * @static
 417     */
 418    getMonthNumber : function(name) {
 419        // handle camel casing for english month names (since the keys for the Date.monthNumbers hash are case sensitive)
 420        return Date.monthNumbers[name.substring(0, 1).toUpperCase() + name.substring(1, 3).toLowerCase()];
 421    },
 422
 423    /**
 424     * The base format-code to formatting-function hashmap used by the {@link #format} method.
 425     * Formatting functions are strings (or functions which return strings) which
 426     * will return the appropriate value when evaluated in the context of the Date object
 427     * from which the {@link #format} method is called.
 428     * Add to / override these mappings for custom date formatting.
 429     * Note: Date.format() treats characters as literals if an appropriate mapping cannot be found.
 430     * Example:
 431     * <pre><code>
 432Date.formatCodes.x = "String.leftPad(this.getDate(), 2, '0')";
 433(new Date()).format("X"); // returns the current day of the month
 434</code></pre>
 435     * @type Object
 436     * @static
 437     */
 438    formatCodes : {
 439        d: "String.leftPad(this.getDate(), 2, '0')",
 440        D: "Date.getShortDayName(this.getDay())", // get localised short day name
 441        j: "this.getDate()",
 442        l: "Date.dayNames[this.getDay()]",
 443        N: "(this.getDay() ? this.getDay() : 7)",
 444        S: "this.getSuffix()",
 445        w: "this.getDay()",
 446        z: "this.getDayOfYear()",
 447        W: "String.leftPad(this.getWeekOfYear(), 2, '0')",
 448        F: "Date.monthNames[this.getMonth()]",
 449        m: "String.leftPad(this.getMonth() + 1, 2, '0')",
 450        M: "Date.getShortMonthName(this.getMonth())", // get localised short month name
 451        n: "(this.getMonth() + 1)",
 452        t: "this.getDaysInMonth()",
 453        L: "(this.isLeapYear() ? 1 : 0)",
 454        o: "(this.getFullYear() + (this.getWeekOfYear() == 1 && this.getMonth() > 0 ? +1 : (this.getWeekOfYear() >= 52 && this.getMonth() < 11 ? -1 : 0)))",
 455        Y: "this.getFullYear()",
 456        y: "('' + this.getFullYear()).substring(2, 4)",
 457        a: "(this.getHours() < 12 ? 'am' : 'pm')",
 458        A: "(this.getHours() < 12 ? 'AM' : 'PM')",
 459        g: "((this.getHours() % 12) ? this.getHours() % 12 : 12)",
 460        G: "this.getHours()",
 461        h: "String.leftPad((this.getHours() % 12) ? this.getHours() % 12 : 12, 2, '0')",
 462        H: "String.leftPad(this.getHours(), 2, '0')",
 463        i: "String.leftPad(this.getMinutes(), 2, '0')",
 464        s: "String.leftPad(this.getSeconds(), 2, '0')",
 465        u: "String.leftPad(this.getMilliseconds(), 3, '0')",
 466        O: "this.getGMTOffset()",
 467        P: "this.getGMTOffset(true)",
 468        T: "this.getTimezone()",
 469        Z: "(this.getTimezoneOffset() * -60)",
 470
 471        c: function() { // ISO-8601 -- GMT format
 472            for (var c = "Y-m-dTH:i:sP", code = [], i = 0, l = c.length; i < l; ++i) {
 473                var e = c.charAt(i);
 474                code.push(e == "T" ? "'T'" : Date.getFormatCode(e)); // treat T as a character literal
 475            }
 476            return code.join(" + ");
 477        },
 478        /*
 479        c: function() { // ISO-8601 -- UTC format
 480            return [
 481              "this.getUTCFullYear()", "'-'",
 482              "String.leftPad(this.getUTCMonth() + 1, 2, '0')", "'-'",
 483              "String.leftPad(this.getUTCDate(), 2, '0')",
 484              "'T'",
 485              "String.leftPad(this.getUTCHours(), 2, '0')", "':'",
 486              "String.leftPad(this.getUTCMinutes(), 2, '0')", "':'",
 487              "String.leftPad(this.getUTCSeconds(), 2, '0')",
 488              "'Z'"
 489            ].join(" + ");
 490        },
 491        */
 492
 493        U: "Math.round(this.getTime() / 1000)"
 494    },
 495
 496    /**
 497     * Checks if the passed Date parameters will cause a javascript Date "rollover".
 498     * @param {Number} year 4-digit year
 499     * @param {Number} month 1-based month-of-year
 500     * @param {Number} day Day of month
 501     * @param {Number} hour (optional) Hour
 502     * @param {Number} minute (optional) Minute
 503     * @param {Number} second (optional) Second
 504     * @param {Number} millisecond (optional) Millisecond
 505     * @return {Boolean} true if the passed parameters do not cause a Date "rollover", false otherwise.
 506     * @static
 507     */
 508    isValid : function(y, m, d, h, i, s, ms) {
 509        // setup defaults
 510        h = h || 0;
 511        i = i || 0;
 512        s = s || 0;
 513        ms = ms || 0;
 514
 515        var dt = new Date(y, m - 1, d, h, i, s, ms);
 516
 517        return y == dt.getFullYear() &&
 518            m == dt.getMonth() + 1 &&
 519            d == dt.getDate() &&
 520            h == dt.getHours() &&
 521            i == dt.getMinutes() &&
 522            s == dt.getSeconds() &&
 523            ms == dt.getMilliseconds();
 524    },
 525
 526    /**
 527     * Parses the passed string using the specified date format.
 528     * Note that this function expects normal calendar dates, meaning that months are 1-based (i.e. 1 = January).
 529     * The {@link #defaults} hash will be used for any date value (i.e. year, month, day, hour, minute, second or millisecond)
 530     * which cannot be found in the passed string. If a corresponding default date value has not been specified in the {@link #defaults} hash,
 531     * the current date's year, month, day or DST-adjusted zero-hour time value will be used instead.
 532     * Keep in mind that the input date string must precisely match the specified format string
 533     * in order for the parse operation to be successful (failed parse operations return a null value).
 534     * <p>Example:</p><pre><code>
 535//dt = Fri May 25 2007 (current date)
 536var dt = new Date();
 537
 538//dt = Thu May 25 2006 (today&#39;s month/day in 2006)
 539dt = Date.parseDate("2006", "Y");
 540
 541//dt = Sun Jan 15 2006 (all date parts specified)
 542dt = Date.parseDate("2006-01-15", "Y-m-d");
 543
 544//dt = Sun Jan 15 2006 15:20:01
 545dt = Date.parseDate("2006-01-15 3:20:01 PM", "Y-m-d g:i:s A");
 546
 547// attempt to parse Sun Feb 29 2006 03:20:01 in strict mode
 548dt = Date.parseDate("2006-02-29 03:20:01", "Y-m-d H:i:s", true); // returns null
 549</code></pre>
 550     * @param {String} input The raw date string.
 551     * @param {String} format The expected date string format.
 552     * @param {Boolean} strict (optional) True to validate date strings while parsing (i.e. prevents javascript Date "rollover")
 553                        (defaults to false). Invalid date strings will return null when parsed.
 554     * @return {Date} The parsed Date.
 555     * @static
 556     */
 557    parseDate : function(input, format, strict) {
 558        var p = Date.parseFunctions;
 559        if (p[format] == null) {
 560            Date.createParser(format);
 561        }
 562        return p[format](input, Ext.isDefined(strict) ? strict : Date.useStrict);
 563    },
 564
 565    // private
 566    getFormatCode : function(character) {
 567        var f = Date.formatCodes[character];
 568
 569        if (f) {
 570          f = typeof f == 'function'? f() : f;
 571          Date.formatCodes[character] = f; // reassign function result to prevent repeated execution
 572        }
 573
 574        // note: unknown characters are treated as literals
 575        return f || ("'" + String.escape(character) + "'");
 576    },
 577
 578    // private
 579    createFormat : function(format) {
 580        var code = [],
 581            special = false,
 582            ch = '';
 583
 584        for (var i = 0; i < format.length; ++i) {
 585            ch = format.charAt(i);
 586            if (!special && ch == "\\") {
 587                special = true;
 588            } else if (special) {
 589                special = false;
 590                code.push("'" + String.escape(ch) + "'");
 591            } else {
 592                code.push(Date.getFormatCode(ch))
 593            }
 594        }
 595        Date.formatFunctions[format] = new Function("return " + code.join('+'));
 596    },
 597
 598    // private
 599    createParser : function() {
 600        var code = [
 601            "var dt, y, m, d, h, i, s, ms, o, z, zz, u, v,",
 602                "def = Date.defaults,",
 603                "results = String(input).match(Date.parseRegexes[{0}]);", // either null, or an array of matched strings
 604
 605            "if(results){",
 606                "{1}",
 607
 608                "if(u != null){", // i.e. unix time is defined
 609                    "v = new Date(u * 1000);", // give top priority to UNIX time
 610                "}else{",
 611                    // create Date object representing midnight of the current day;
 612                    // this will provide us with our date defaults
 613                    // (note: clearTime() handles Daylight Saving Time automatically)
 614                    "dt = (new Date()).clearTime();",
 615
 616                    // date calculations (note: these calculations create a dependency on Ext.num())
 617                    "y = y >= 0? y : Ext.num(def.y, dt.getFullYear());",
 618                    "m = m >= 0? m : Ext.num(def.m - 1, dt.getMonth());",
 619                    "d = d >= 0? d : Ext.num(def.d, dt.getDate());",
 620
 621                    // time calculations (note: these calculations create a dependency on Ext.num())
 622                    "h  = h || Ext.num(def.h, dt.getHours());",
 623                    "i  = i || Ext.num(def.i, dt.getMinutes());",
 624                    "s  = s || Ext.num(def.s, dt.getSeconds());",
 625                    "ms = ms || Ext.num(def.ms, dt.getMilliseconds());",
 626
 627                    "if(z >= 0 && y >= 0){",
 628                        // both the year and zero-based day of year are defined and >= 0.
 629                        // these 2 values alone provide sufficient info to create a full date object
 630
 631                        // create Date object representing January 1st for the given year
 632                        "v = new Date(y, 0, 1, h, i, s, ms);",
 633
 634                        // then add day of year, checking for Date "rollover" if necessary
 635                        "v = !strict? v : (strict === true && (z <= 364 || (v.isLeapYear() && z <= 365))? v.add(Date.DAY, z) : null);",
 636                    "}else if(strict === true && !Date.isValid(y, m + 1, d, h, i, s, ms)){", // check for Date "rollover"
 637                        "v = null;", // invalid date, so return null
 638                    "}else{",
 639                        // plain old Date object
 640                        "v = new Date(y, m, d, h, i, s, ms);",
 641                    "}",
 642                "}",
 643            "}",
 644
 645            "if(v){",
 646                // favour UTC offset over GMT offset
 647                "if(zz != null){",
 648                    // reset to UTC, then add offset
 649                    "v = v.add(Date.SECOND, -v.getTimezoneOffset() * 60 - zz);",
 650                "}else if(o){",
 651                    // reset to GMT, then add offset
 652                    "v = v.add(Date.MINUTE, -v.getTimezoneOffset() + (sn == '+'? -1 : 1) * (hr * 60 + mn));",
 653                "}",
 654            "}",
 655
 656            "return v;"
 657        ].join('\n');
 658
 659        return function(format) {
 660            var regexNum = Date.parseRegexes.length,
 661                currentGroup = 1,
 662                calc = [],
 663                regex = [],
 664                special = false,
 665                ch = "";
 666
 667            for (var i = 0; i < format.length; ++i) {
 668                ch = format.charAt(i);
 669                if (!special && ch == "\\") {
 670                    special = true;
 671                } else if (special) {
 672                    special = false;
 673                    regex.push(String.escape(ch));
 674                } else {
 675                    var obj = $f(ch, currentGroup);
 676                    currentGroup += obj.g;
 677                    regex.push(obj.s);
 678                    if (obj.g && obj.c) {
 679                        calc.push(obj.c);
 680                    }
 681                }
 682            }
 683
 684            Date.parseRegexes[regexNum] = new RegExp("^" + regex.join('') + "$", "i");
 685            Date.parseFunctions[format] = new Function("input", "strict", xf(code, regexNum, calc.join('')));
 686        }
 687    }(),
 688
 689    // private
 690    parseCodes : {
 691        /*
 692         * Notes:
 693         * g = {Number} calculation group (0 or 1. only group 1 contributes to date calculations.)
 694         * c = {String} calculation method (required for group 1. null for group 0. {0} = currentGroup - position in regex result array)
 695         * s = {String} regex pattern. all matches are stored in results[], and are accessible by the calculation mapped to 'c'
 696         */
 697        d: {
 698            g:1,
 699            c:"d = parseInt(results[{0}], 10);\n",
 700            s:"(\\d{2})" // day of month with leading zeroes (01 - 31)
 701        },
 702        j: {
 703            g:1,
 704            c:"d = parseInt(results[{0}], 10);\n",
 705            s:"(\\d{1,2})" // day of month without leading zeroes (1 - 31)
 706        },
 707        D: function() {
 708            for (var a = [], i = 0; i < 7; a.push(Date.getShortDayName(i)), ++i); // get localised short day names
 709            return {
 710                g:0,
 711                c:null,
 712                s:"(?:" + a.join("|") +")"
 713            }
 714        },
 715        l: function() {
 716            return {
 717                g:0,
 718                c:null,
 719                s:"(?:" + Date.dayNames.join("|") + ")"
 720            }
 721        },
 722        N: {
 723            g:0,
 724            c:null,
 725            s:"[1-7]" // ISO-8601 day number (1 (monday) - 7 (sunday))
 726        },
 727        S: {
 728            g:0,
 729            c:null,
 730            s:"(?:st|nd|rd|th)"
 731        },
 732        w: {
 733            g:0,
 734            c:null,
 735            s:"[0-6]" // javascript day number (0 (sunday) - 6 (saturday))
 736        },
 737        z: {
 738            g:1,
 739            c:"z = parseInt(results[{0}], 10);\n",
 740            s:"(\\d{1,3})" // day of the year (0 - 364 (365 in leap years))
 741        },
 742        W: {
 743            g:0,
 744            c:null,
 745            s:"(?:\\d{2})" // ISO-8601 week number (with leading zero)
 746        },
 747        F: function() {
 748            return {
 749                g:1,
 750                c:"m = parseInt(Date.getMonthNumber(results[{0}]), 10);\n", // get localised month number
 751                s:"(" + Date.monthNames.join("|") + ")"
 752            }
 753        },
 754        M: function() {
 755            for (var a = [], i = 0; i < 12; a.push(Date.getShortMonthName(i)), ++i); // get localised short month names
 756            return Ext.applyIf({
 757                s:"(" + a.join("|") + ")"
 758            }, $f("F"));
 759        },
 760        m: {
 761            g:1,
 762            c:"m = parseInt(results[{0}], 10) - 1;\n",
 763            s:"(\\d{2})" // month number with leading zeros (01 - 12)
 764        },
 765        n: {
 766            g:1,
 767            c:"m = parseInt(results[{0}], 10) - 1;\n",
 768            s:"(\\d{1,2})" // month number without leading zeros (1 - 12)
 769        },
 770        t: {
 771            g:0,
 772            c:null,
 773            s:"(?:\\d{2})" // no. of days in the month (28 - 31)
 774        },
 775        L: {
 776            g:0,
 777            c:null,
 778            s:"(?:1|0)"
 779        },
 780        o: function() {
 781            return $f("Y");
 782        },
 783        Y: {
 784            g:1,
 785            c:"y = parseInt(results[{0}], 10);\n",
 786            s:"(\\d{4})" // 4-digit year
 787        },
 788        y: {
 789            g:1,
 790            c:"var ty = parseInt(results[{0}], 10);\n"
 791                + "y = ty > Date.y2kYear ? 1900 + ty : 2000 + ty;\n", // 2-digit year
 792            s:"(\\d{1,2})"
 793        },
 794        a: {
 795            g:1,
 796            c:"if (results[{0}] == 'am') {\n"
 797                + "if (h == 12) { h = 0; }\n"
 798                + "} else { if (h < 12) { h += 12; }}",
 799            s:"(am|pm)"
 800        },
 801        A: {
 802            g:1,
 803            c:"if (results[{0}] == 'AM') {\n"
 804                + "if (h == 12) { h = 0; }\n"
 805                + "} else { if (h < 12) { h += 12; }}",
 806            s:"(AM|PM)"
 807        },
 808        g: function() {
 809            return $f("G");
 810        },
 811        G: {
 812            g:1,
 813            c:"h = parseInt(results[{0}], 10);\n",
 814            s:"(\\d{1,2})" // 24-hr format of an hour without leading zeroes (0 - 23)
 815        },
 816        h: function() {
 817            return $f("H");
 818        },
 819        H: {
 820            g:1,
 821            c:"h = parseInt(results[{0}], 10);\n",
 822            s:"(\\d{2})" //  24-hr format of an hour with leading zeroes (00 - 23)
 823        },
 824        i: {
 825            g:1,
 826            c:"i = parseInt(results[{0}], 10);\n",
 827            s:"(\\d{2})" // minutes with leading zeros (00 - 59)
 828        },
 829        s: {
 830            g:1,
 831            c:"s = parseInt(results[{0}], 10);\n",
 832            s:"(\\d{2})" // seconds with leading zeros (00 - 59)
 833        },
 834        u: {
 835            g:1,
 836            c:"ms = results[{0}]; ms = parseInt(ms, 10)/Math.pow(10, ms.length - 3);\n",
 837            s:"(\\d+)" // decimal fraction of a second (minimum = 1 digit, maximum = unlimited)
 838        },
 839        O: {
 840            g:1,
 841            c:[
 842                "o = results[{0}];",
 843                "var sn = o.substring(0,1),", // get + / - sign
 844                    "hr = o.substring(1,3)*1 + Math.floor(o.substring(3,5) / 60),", // get hours (performs minutes-to-hour conversion also, just in case)
 845                    "mn = o.substring(3,5) % 60;", // get minutes
 846                "o = ((-12 <= (hr*60 + mn)/60) && ((hr*60 + mn)/60 <= 14))? (sn + String.leftPad(hr, 2, '0') + String.leftPad(mn, 2, '0')) : null;\n" // -12hrs <= GMT offset <= 14hrs
 847            ].join("\n"),
 848            s: "([+\-]\\d{4})" // GMT offset in hrs and mins
 849        },
 850        P: {
 851            g:1,
 852            c:[
 853                "o = results[{0}];",
 854                "var sn = o.substring(0,1),", // get + / - sign
 855                    "hr = o.substring(1,3)*1 + Math.floor(o.substring(4,6) / 60),", // get hours (performs minutes-to-hour conversion also, just in case)
 856                    "mn = o.substring(4,6) % 60;", // get minutes
 857                "o = ((-12 <= (hr*60 + mn)/60) && ((hr*60 + mn)/60 <= 14))? (sn + String.leftPad(hr, 2, '0') + String.leftPad(mn, 2, '0')) : null;\n" // -12hrs <= GMT offset <= 14hrs
 858            ].join("\n"),
 859            s: "([+\-]\\d{2}:\\d{2})" // GMT offset in hrs and mins (with colon separator)
 860        },
 861        T: {
 862            g:0,
 863            c:null,
 864            s:"[A-Z]{1,4}" // timezone abbrev. may be between 1 - 4 chars
 865        },
 866        Z: {
 867            g:1,
 868            c:"zz = results[{0}] * 1;\n" // -43200 <= UTC offset <= 50400
 869                  + "zz = (-43200 <= zz && zz <= 50400)? zz : null;\n",
 870            s:"([+\-]?\\d{1,5})" // leading '+' sign is optional for UTC offset
 871        },
 872        c: function() {
 873            var calc = [],
 874                arr = [
 875                    $f("Y", 1), // year
 876                    $f("m", 2), // month
 877                    $f("d", 3), // day
 878                    $f("h", 4), // hour
 879                    $f("i", 5), // minute
 880                    $f("s", 6), // second
 881                    {c:"ms = results[7] || '0'; ms = parseInt(ms, 10)/Math.pow(10, ms.length - 3);\n"}, // decimal fraction of a second (minimum = 1 digit, maximum = unlimited)
 882                    {c:[ // allow either "Z" (i.e. UTC) or "-0530" or "+08:00" (i.e. UTC offset) timezone delimiters. assumes local timezone if no timezone is specified
 883                        "if(results[8]) {", // timezone specified
 884                            "if(results[8] == 'Z'){",
 885                                "zz = 0;", // UTC
 886                            "}else if (results[8].indexOf(':') > -1){",
 887                                $f("P", 8).c, // timezone offset with colon separator
 888                            "}else{",
 889                                $f("O", 8).c, // timezone offset without colon separator
 890                            "}",
 891                        "}"
 892                    ].join('\n')}
 893                ];
 894
 895            for (var i = 0, l = arr.length; i < l; ++i) {
 896                calc.push(arr[i].c);
 897            }
 898
 899            return {
 900                g:1,
 901                c:calc.join(""),
 902                s:[
 903                    arr[0].s, // year (required)
 904                    "(?:", "-", arr[1].s, // month (optional)
 905                        "(?:", "-", arr[2].s, // day (optional)
 906                            "(?:",
 907                                "(?:T| )?", // time delimiter -- either a "T" or a single blank space
 908                                arr[3].s, ":", arr[4].s,  // hour AND minute, delimited by a single colon (optional). MUST be preceded by either a "T" or a single blank space
 909                                "(?::", arr[5].s, ")?", // seconds (optional)
 910                                "(?:(?:\\.|,)(\\d+))?", // decimal fraction of a second (e.g. ",12345" or ".98765") (optional)
 911                                "(Z|(?:[-+]\\d{2}(?::)?\\d{2}))?", // "Z" (UTC) or "-0530" (UTC offset without colon delimiter) or "+08:00" (UTC offset with colon delimiter) (optional)
 912                            ")?",
 913                        ")?",
 914                    ")?"
 915                ].join("")
 916            }
 917        },
 918        U: {
 919            g:1,
 920            c:"u = parseInt(results[{0}], 10);\n",
 921            s:"(-?\\d+)" // leading minus sign indicates seconds before UNIX epoch
 922        }
 923    }
 924});
 925
 926}());
 927
 928Ext.apply(Date.prototype, {
 929    // private
 930    dateFormat : function(format) {
 931        if (Date.formatFunctions[format] == null) {
 932            Date.createFormat(format);
 933        }
 934        return Date.formatFunctions[format].call(this);
 935    },
 936
 937    /**
 938     * Get the timezone abbreviation of the current date (equivalent to the format specifier 'T').
 939     *
 940     * Note: The date string returned by the javascript Date object's toString() method varies
 941     * between browsers (e.g. FF vs IE) and system region settings (e.g. IE in Asia vs IE in America).
 942     * For a given date string e.g. "Thu Oct 25 2007 22:55:35 GMT+0800 (Malay Peninsula Standard Time)",
 943     * getTimezone() first tries to get the timezone abbreviation from between a pair of parentheses
 944     * (which may or may not be present), failing which it proceeds to get the timezone abbreviation
 945     * from the GMT offset portion of the date string.
 946     * @return {String} The abbreviated timezone name (e.g. 'CST', 'PDT', 'EDT', 'MPST' ...).
 947     */
 948    getTimezone : function() {
 949        // the following list shows the differences between date strings from different browsers on a WinXP SP2 machine from an Asian locale:
 950        //
 951        // Opera  : "Thu, 25 Oct 2007 22:53:45 GMT+0800" -- shortest (weirdest) date string of the lot
 952        // Safari : "Thu Oct 25 2007 22:55:35 GMT+0800 (Malay Peninsula Standard Time)" -- value in parentheses always gives the correct timezone (same as FF)
 953        // FF     : "Thu Oct 25 2007 22:55:35 GMT+0800 (Malay Peninsula Standard Time)" -- value in parentheses always gives the correct timezone
 954        // IE     : "Thu Oct 25 22:54:35 UTC+0800 2007" -- (Asian system setting) look for 3-4 letter timezone abbrev
 955        // IE     : "Thu Oct 25 17:06:37 PDT 2007" -- (American system setting) look for 3-4 letter timezone abbrev
 956        //
 957        // this crazy regex attempts to guess the correct timezone abbreviation despite these differences.
 958        // step 1: (?:\((.*)\) -- find timezone in parentheses
 959        // step 2: ([A-Z]{1,4})(?:[\-+][0-9]{4})?(?: -?\d+)?) -- if nothing was found in step 1, find timezone from timezone offset portion of date string
 960        // step 3: remove all non uppercase characters found in step 1 and 2
 961        return this.toString().replace(/^.* (?:\((.*)\)|([A-Z]{1,4})(?:[\-+][0-9]{4})?(?: -?\d+)?)$/, "$1$2").replace(/[^A-Z]/g, "");
 962    },
 963
 964    /**
 965     * Get the offset from GMT of the current date (equivalent to the format specifier 'O').
 966     * @param {Boolean} colon (optional) true to separate the hours and minutes with a colon (defaults to false).
 967     * @return {String} The 4-character offset string prefixed with + or - (e.g. '-0600').
 968     */
 969    getGMTOffset : function(colon) {
 970        return (this.getTimezoneOffset() > 0 ? "-" : "+")
 971            + String.leftPad(Math.floor(Math.abs(this.getTimezoneOffset()) / 60), 2, "0")
 972            + (colon ? ":" : "")
 973            + String.leftPad(Math.abs(this.getTimezoneOffset() % 60), 2, "0");
 974    },
 975
 976    /**
 977     * Get the numeric day number of the year, adjusted for leap year.
 978     * @return {Number} 0 to 364 (365 in leap years).
 979     */
 980    getDayOfYear: function() {
 981        var i = 0,
 982            num = 0,
 983            d = this.clone(),
 984            m = this.getMonth();
 985
 986        for (i = 0, d.setMonth(0); i < m; d.setMonth(++i)) {
 987            num += d.getDaysInMonth();
 988        }
 989        return num + this.getDate() - 1;
 990    },
 991
 992    /**
 993     * Get the numeric ISO-8601 week number of the year.
 994     * (equivalent to the format specifier 'W', but without a leading zero).
 995     * @return {Number} 1 to 53
 996     */
 997    getWeekOfYear : function() {
 998        // adapted from http://www.merlyn.demon.co.uk/weekcalc.htm
 999        var ms1d = 864e5, // milliseconds in a day
1000            ms7d = 7 * ms1d; // milliseconds in a week
1001
1002        return function() { // return a closure so constants get calculated only once
1003            var DC3 = Date.UTC(this.getFullYear(), this.getMonth(), this.getDate() + 3) / ms1d, // an Absolute Day Number
1004                AWN = Math.floor(DC3 / 7), // an Absolute Week Number
1005                Wyr = new Date(AWN * ms7d).getUTCFullYear();
1006
1007            return AWN - Math.floor(Date.UTC(Wyr, 0, 7) / ms7d) + 1;
1008        }
1009    }(),
1010
1011    /**
1012     * Checks if the current date falls within a leap year.
1013     * @return {Boolean} True if the current date falls within a leap year, false otherwise.
1014     */
1015    isLeapYear : function() {
1016        var year = this.getFullYear();
1017        return !!((year & 3) == 0 && (year % 100 || (year % 400 == 0 && year)));
1018    },
1019
1020    /**
1021     * Get the first day of the current month, adjusted for leap year.  The returned value
1022     * is the numeric day index within the week (0-6) which can be used in conjunction with
1023     * the {@link #monthNames} array to retrieve the textual day name.
1024     * Example:
1025     * <pre><code>
1026var dt = new Date('1/10/2007');
1027document.write(Date.dayNames[dt.getFirstDayOfMonth()]); //output: 'Monday'
1028</code></pre>
1029     * @return {Number} The day number (0-6).
1030     */
1031    getFirstDayOfMonth : function() {
1032        var day = (this.getDay() - (this.getDate() - 1)) % 7;
1033        return (day < 0) ? (day + 7) : day;
1034    },
1035
1036    /**
1037     * Get the last day of the current month, adjusted for leap year.  The returned value
1038     * is the numeric day index within the week (0-6) which can be used in conjunction with
1039     * the {@link #monthNames} array to retrieve the textual day name.
1040     * Example:
1041     * <pre><code>
1042var dt = new Date('1/10/2007');
1043document.write(Date.dayNames[dt.getLastDayOfMonth()]); //output: 'Wednesday'
1044</code></pre>
1045     * @return {Number} The day number (0-6).
1046     */
1047    getLastDayOfMonth : function() {
1048        return this.getLastDateOfMonth().getDay();
1049    },
1050
1051
1052    /**
1053     * Get the date of the first day of the month in which this date resides.
1054     * @return {Date}
1055     */
1056    getFirstDateOfMonth : function() {
1057        return new Date(this.getFullYear(), this.getMonth(), 1);
1058    },
1059
1060    /**
1061     * Get the date of the last day of the month in which this date resides.
1062     * @return {Date}
1063     */
1064    getLastDateOfMonth : function() {
1065        return new Date(this.getFullYear(), this.getMonth(), this.getDaysInMonth());
1066    },
1067
1068    /**
1069     * Get the number of days in the current month, adjusted for leap year.
1070     * @return {Number} The number of days in the month.
1071     */
1072    getDaysInMonth: function() {
1073        var daysInMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
1074
1075        return function() { // return a closure for efficiency
1076            var m = this.getMonth();
1077
1078            return m == 1 && this.isLeapYear() ? 29 : daysInMonth[m];
1079        }
1080    }(),
1081
1082    /**
1083     * Get the English ordinal suffix of the current day (equivalent to the format specifier 'S').
1084     * @return {String} 'st, 'nd', 'rd' or 'th'.
1085     */
1086    getSuffix : function() {
1087        switch (this.getDate()) {
1088            case 1:
1089            case 21:
1090            case 31:
1091                return "st";
1092            case 2:
1093            case 22:
1094                return "nd";
1095            case 3:
1096            case 23:
1097                return "rd";
1098            default:
1099                return "th";
1100        }
1101    },
1102
1103    /**
1104     * Creates and returns a new Date instance with the exact same date value as the called instance.
1105     * Dates are copied and passed by reference, so if a copied date variable is modified later, the original
1106     * variable will also be changed.  When the intention is to create a new variable that will not
1107     * modify the original instance, you should create a clone.
1108     *
1109     * Example of correctly cloning a date:
1110     * <pre><code>
1111//wrong way:
1112var orig = new Date('10/1/2006');
1113var copy = orig;
1114copy.setDate(5);
1115document.write(orig);  //returns 'Thu Oct 05 2006'!
1116
1117//correct way:
1118var orig = new Date('10/1/2006');
1119var copy = orig.clone();
1120copy.setDate(5);
1121document.write(orig);  //returns 'Thu Oct 01 2006'
1122</code></pre>
1123     * @return {Date} The new Date instance.
1124     */
1125    clone : function() {
1126        return new Date(this.getTime());
1127    },
1128
1129    /**
1130     * Checks if the current date is affected by Daylight Saving Time (DST).
1131     * @return {Boolean} True if the current date is affected by DST.
1132     */
1133    isDST : function() {
1134        // adapted from http://extjs.com/forum/showthread.php?p=247172#post247172
1135        // courtesy of @geoffrey.mcgill
1136        return new Date(this.getFullYear(), 0, 1).getTimezoneOffset() != this.getTimezoneOffset();
1137    },
1138
1139    /**
1140     * Attempts to clear all time information from this Date by setting the time to midnight of the same day,
1141     * automatically adjusting for Daylight Saving Time (DST) where applicable.
1142     * (note: DST timezone information for the browser's host operating system is assumed to be up-to-date)
1143     * @param {Boolean} clone true to create a clone of this date, clear the time and return it (defaults to false).
1144     * @return {Date} this or the clone.
1145     */
1146    clearTime : function(clone) {
1147        if (clone) {
1148            return this.clone().clearTime();
1149        }
1150
1151        // get current date before clearing time
1152        var d = this.getDate();
1153
1154        // clear time
1155        this.setHours(0);
1156        this.setMinutes(0);
1157        this.setSeconds(0);
1158        this.setMilliseconds(0);
1159
1160        if (this.getDate() != d) { // account for DST (i.e. day of month changed when setting hour = 0)
1161            // note: DST adjustments are assumed to occur in multiples of 1 hour (this is almost always the case)
1162            // refer to http://www.timeanddate.com/time/aboutdst.html for the (rare) exceptions to this rule
1163
1164            // increment hour until cloned date == current date
1165            for (var hr = 1, c = this.add(Date.HOUR, hr); c.getDate() != d; hr++, c = this.add(Date.HOUR, hr));
1166
1167            this.setDate(d);
1168            this.setHours(c.getHours());
1169        }
1170
1171        return this;
1172    },
1173
1174    /**
1175     * Provides a convenient method for performing basic date arithmetic. This method
1176     * does not modify the Date instance being called - it creates and returns
1177     * a new Date instance containing the resulting date value.
1178     *
1179     * Examples:
1180     * <pre><code>
1181// Basic usage:
1182var dt = new Date('10/29/2006').add(Date.DAY, 5);
1183document.write(dt); //returns 'Fri Nov 03 2006 00:00:00'
1184
1185// Negative values will be subtracted:
1186var dt2 = new Date('10/1/2006').add(Date.DAY, -5);
1187document.write(dt2); //returns 'Tue Sep 26 2006 00:00:00'
1188
1189// You can even chain several calls together in one line:
1190var dt3 = new Date('10/1/2006').add(Date.DAY, 5).add(Date.HOUR, 8).add(Date.MINUTE, -30);
1191document.write(dt3); //returns 'Fri Oct 06 2006 07:30:00'
1192</code></pre>
1193     *
1194     * @param {String} interval A valid date interval enum value.
1195     * @param {Number} value The amount to add to the current date.
1196     * @return {Date} The new Date instance.
1197     */
1198    add : function(interval, value) {
1199        var d = this.clone();
1200        if (!interval || value === 0) return d;
1201
1202        switch(interval.toLowerCase()) {
1203            case Date.MILLI:
1204                d.setMilliseconds(this.getMilliseconds() + value);
1205                break;
1206            case Date.SECOND:
1207                d.setSeconds(this.getSeconds() + value);
1208                break;
1209            case Date.MINUTE:
1210                d.setMinutes(this.getMinutes() + value);
1211                break;
1212            case Date.HOUR:
1213                d.setHours(this.getHours() + value);
1214                break;
1215            case Date.DAY:
1216                d.setDate(this.getDate(

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