/*

--------------------------------------------------------

dateformat.js - Simple date formatter

Version 1.1 (Update 2008/04/02)



Copyright (c) 2007-2008 onozaty (http://www.enjoyxstudy.com)



Released under an MIT-style license.



For details, see the web site:

 http://www.enjoyxstudy.com/javascript/dateformat/



--------------------------------------------------------

patterns

y : Year         ex. "yyyy" -> "2007", "yy" -> "07"

M : Month        ex. "MM" -> "05" "12", "M" -> "5" "12"

d : Day          ex. "dd" -> "09" "30", "d" -> "9" "30"

H : Hour (0-23)  ex. "HH" -> "00" "23", "H" -> "0" "23"

m : Minute       ex. "mm" -> "01" "59", "m" -> "1" "59"

s : Second       ex. "ss" -> "00" "59", "H" -> "0" "59"

S : Millisecond  ex. "SSS" -> "000" "012" "999", 

                     "SS" -> "00" "12" "999", "S" -> "0" "12" "999"



Text can be quoted using single quotes (') to avoid interpretation.

"''" represents a single quote. 





Useing..



 var fmt = new DateFormat("yyyy/MM/dd HH:mm:ss SSS");



 var str = fmt.format(new Date()); // "2007/05/10 12:21:19 002"

 var date = fmt.parse("2007/05/10 12:21:19 002"); // return Date object



--------------------------------------------------------

*/



var DateFormat = function(pattern) {

  this._init(pattern);

};



DateFormat.prototype = {

  _init: function(pattern) {



    this.pattern = pattern;

    this._patterns = [];



    for (var i = 0; i < pattern.length; i++) {

      var ch = pattern.charAt(i);

      if (this._patterns.length == 0) {

        this._patterns[0] = ch;

      } else {

        var index = this._patterns.length - 1;

        if (this._patterns[index].charAt(0) == "'") {

          if (this._patterns[index].length == 1 

             || this._patterns[index].charAt(this._patterns[index].length - 1) != "'") {

            this._patterns[index] += ch;

          } else {

            this._patterns[index + 1] = ch;

          }

        } else if (this._patterns[index].charAt(0) == ch) {

          this._patterns[index] += ch;

        } else {

          this._patterns[index + 1] = ch;

        }

      }

    }

  },



  format: function(date) {



    var result = [];

    for (var i = 0; i < this._patterns.length; i++) {

      result[i] = this._formatWord(date, this._patterns[i]);

    }

    return result.join('');

  },

  _formatWord: function(date, pattern) {



    var formatter = this._formatter[pattern.charAt(0)];

    if (formatter) {

      return formatter.apply(this, [date, pattern]);

    } else {

      return pattern;

    }

  },

  _formatter: {

    "y": function(date, pattern) {

      // Year

      var year = String(date.getFullYear());

      if (pattern.length <= 2) {

        year = year.substring(2, 4);

      } else {

        year = this._zeroPadding(year, pattern.length);

      }

      return year;

    },

    "M": function(date, pattern) {

      // Month in year

      return this._zeroPadding(String(date.getMonth() + 1), pattern.length);

    },

    "d": function(date, pattern) {

      // Day in month

      return this._zeroPadding(String(date.getDate()), pattern.length);

    },

    "H": function(date, pattern) {

      // Hour in day (0-23)

      return this._zeroPadding(String(date.getHours()), pattern.length);

    },

    "m": function(date, pattern) {

      // Minute in hour

      return this._zeroPadding(String(date.getMinutes()), pattern.length);

    },

    "s": function(date, pattern) {

      // Second in minute

      return this._zeroPadding(String(date.getSeconds()), pattern.length);

    },

    "S": function(date, pattern) {

      // Millisecond

      return this._zeroPadding(String(date.getMilliseconds()), pattern.length);

    },

    "'": function(date, pattern) {

      // escape

      if (pattern == "''") {

        return "'";

      } else {

        return pattern.replace(/'/g, '');

      }

    }

  },



  _zeroPadding: function(str, length) {

    if (str.length >= length) {

      return str;

    }



    return new Array(length - str.length + 1).join("0") + str;

  },





  /// Parser ///

  parse: function(text) {



    if (typeof text != 'string' || text == '') return null;



    var result = {year: 1970, month: 1, day: 1, hour: 0, min: 0, sec: 0, msec: 0};



    for (var i = 0; i < this._patterns.length; i++) {

       if (text == '') return null; // parse error!!

       text = this._parseWord(text, this._patterns[i], result);

       if (text === null) return null; // parse error!!

    }

    if (text != '') return null; // parse error!!



    return new Date(

                result.year,

                result.month - 1,

                result.day,

                result.hour,

                result.min,

                result.sec,

                result.msec);

  },

  _parseWord: function(text, pattern, result) {



    var parser = this._parser[pattern.charAt(0)];

    if (parser) {

      return parser.apply(this, [text, pattern, result]);

    } else {

      if (text.indexOf(pattern) != 0) {

        return null;

      } else {

        return text.substring(pattern.length);

      }

    }

  },

  _parser: {

    "y": function(text, pattern, result) {

      // Year

      var year;

      if (pattern.length <= 2) {

        year = text.substring(0, 2);

        year = year < 70 ? '20' + year : '19' + year;

        text = text.substring(2);

      } else {

        var length = (pattern.length == 3) ? 4 : pattern.length;

        year = text.substring(0, length);

        text = text.substring(length);

      }

      if (!this._isNumber(year)) return null; // error

      result.year = parseInt(year, 10);

      return text;

    },

    "M": function(text, pattern, result) {

      // Month in year

      var month;

      if (pattern.length == 1 && text.length > 1

          && text.substring(0, 2).match(/1[0-2]/) != null) {

        month = text.substring(0, 2);

        text  = text.substring(2);

      } else {

        month = text.substring(0, pattern.length);

        text  = text.substring(pattern.length);

      }

      if (!this._isNumber(month)) return null; // error

      result.month = parseInt(month, 10);

      return text;

    },

    "d": function(text, pattern, result) {

      // Day in month

      var day;

      if (pattern.length == 1 && text.length > 1 

          && text.substring(0, 2).match(/1[0-9]|2[0-9]|3[0-1]/) != null) {

        day  = text.substring(0, 2);

        text = text.substring(2);

      } else {

        day  = text.substring(0, pattern.length);

        text = text.substring(pattern.length);

      }

      if (!this._isNumber(day)) return null; // error

      result.day = parseInt(day, 10);

      return text;

    },

    "H": function(text, pattern, result) {

      // Hour in day (0-23)

      var hour;

      if (pattern.length == 1 && text.length > 1

          && text.substring(0, 2).match(/1[0-9]|2[0-3]/) != null) {

        hour = text.substring(0, 2);

        text = text.substring(2);

      } else {

        hour = text.substring(0, pattern.length);

        text = text.substring(pattern.length);

      }

      if (!this._isNumber(hour)) return null; // error

      result.hour = parseInt(hour, 10);

      return text;

    },

    "m": function(text, pattern, result) {

      // Minute in hour

      var min;

      if (pattern.length == 1 && text.length > 1

          && text.substring(0, 2).match(/[1-5][0-9]/) != null) {

        min  = text.substring(0, 2);

        text = text.substring(2);

      } else {

        min  = text.substring(0, pattern.length);

        text = text.substring(pattern.length);

      }

      if (!this._isNumber(min)) return null; // error

      result.min = parseInt(min, 10);

      return text;

    },

    "s": function(text, pattern, result) {

      // Second in minute

      var sec;

      if (pattern.length == 1 && text.length > 1

          && text.substring(0, 2).match(/[1-5][0-9]/) != null) {

        sec  = text.substring(0, 2);

        text = text.substring(2);

      } else {

        sec  = text.substring(0, pattern.length);

        text = text.substring(pattern.length);

      }

      if (!this._isNumber(sec)) return null; // error

      result.sec = parseInt(sec, 10);

      return text;

    },

    "S": function(text, pattern, result) {

      // Millimsecond

      var msec;

      if (pattern.length == 1 || pattern.length == 2) {

        if (text.length > 2 && text.substring(0, 3).match(/[1-9][0-9][0-9]/) != null) {

          msec = text.substring(0, 3);

          text = text.substring(3);

        } else if (text.length > 1 && text.substring(0, 2).match(/[1-9][0-9]/) != null) {

          msec = text.substring(0, 2);

          text = text.substring(2);

        } else {

          msec = text.substring(0, pattern.length);

          text = text.substring(pattern.length);

        }

      } else {

        msec = text.substring(0, pattern.length);

        text = text.substring(pattern.length);

      }

      if (!this._isNumber(msec)) return null; // error

      result.msec = parseInt(msec, 10);

      return text;

    },

    "'": function(text, pattern, result) {

      // escape

      if (pattern == "''") {

        pattern = "'";

      } else {

        pattern = pattern.replace(/'/g, '');

      }

      if (text.indexOf(pattern) != 0) {

        return null; // error

      } else {

        return text.substring(pattern.length);

      }

    }

  },



  _isNumber: function(str) {

    return /^[0-9]*$/.test(str);

  }

}