/*==================================================

 *  Default Unit

 *==================================================

 */



SimileAjax.NativeDateUnit = new Object();



SimileAjax.NativeDateUnit.makeDefaultValue = function() {

    return new Date();

};



SimileAjax.NativeDateUnit.cloneValue = function(v) {

    return new Date(v.getTime());

};


SimileAjax.NativeDateUnit.getParser = function(format) {
    if (typeof format == "string") {
        format = format.toLowerCase();
    }
    
    var parser = (format == "iso8601" || format == "iso 8601") ?

                    SimileAjax.DateTime.parseIso8601DateTime : 

                    SimileAjax.DateTime.parseGregorianDateTime;
                    
    return function(d) {
        if (typeof d != 'undefined' && typeof d.toUTCString == "function") {
            return d;
        } else {
            return parser(d);
        }
    };
};


SimileAjax.NativeDateUnit.parseFromObject = function(o) {

    return SimileAjax.DateTime.parseGregorianDateTime(o);

};



SimileAjax.NativeDateUnit.toNumber = function(v) {

    return v.getTime();

};



SimileAjax.NativeDateUnit.fromNumber = function(n) {

    return new Date(n);

};



SimileAjax.NativeDateUnit.compare = function(v1, v2) {

    var n1, n2;

    if (typeof v1 == "object") {

        n1 = v1.getTime();

    } else {

        n1 = Number(v1);

    }

    if (typeof v2 == "object") {

        n2 = v2.getTime();

    } else {

        n2 = Number(v2);

    }

    

    return n1 - n2;

};



SimileAjax.NativeDateUnit.earlier = function(v1, v2) {

    return SimileAjax.NativeDateUnit.compare(v1, v2) < 0 ? v1 : v2;

};



SimileAjax.NativeDateUnit.later = function(v1, v2) {

    return SimileAjax.NativeDateUnit.compare(v1, v2) > 0 ? v1 : v2;

};



SimileAjax.NativeDateUnit.change = function(v, n) {

    return new Date(v.getTime() + n);

};