source: Dev/trunk/src/client/dojo/date/stamp.js

define(["../_base/lang", "../_base/array"], function(lang, array){

// module:
//              dojo/date/stamp

var stamp = {
        // summary:
        //              TODOC
};
lang.setObject("dojo.date.stamp", stamp);

// Methods to convert dates to or from a wire (string) format using well-known conventions

stamp.fromISOString = function(/*String*/ formattedString, /*Number?*/ defaultTime){
        // summary:
        //              Returns a Date object given a string formatted according to a subset of the ISO-8601 standard.
        //
        // description:
        //              Accepts a string formatted according to a profile of ISO8601 as defined by
        //              [RFC3339](http://www.ietf.org/rfc/rfc3339.txt), except that partial input is allowed.
        //              Can also process dates as specified [by the W3C](http://www.w3.org/TR/NOTE-datetime)
        //              The following combinations are valid:
        //
        //              - dates only
        //                      - yyyy
        //                      - yyyy-MM
        //                      - yyyy-MM-dd
        //              - times only, with an optional time zone appended
        //                      - THH:mm
        //                      - THH:mm:ss
        //                      - THH:mm:ss.SSS
        //              - and "datetimes" which could be any combination of the above
        //
        //              timezones may be specified as Z (for UTC) or +/- followed by a time expression HH:mm
        //              Assumes the local time zone if not specified.  Does not validate.  Improperly formatted
        //              input may return null.  Arguments which are out of bounds will be handled
        //              by the Date constructor (e.g. January 32nd typically gets resolved to February 1st)
        //              Only years between 100 and 9999 are supported.
        // formattedString:
        //              A string such as 2005-06-30T08:05:00-07:00 or 2005-06-30 or T08:05:00
        // defaultTime:
        //              Used for defaults for fields omitted in the formattedString.
        //              Uses 1970-01-01T00:00:00.0Z by default.

        if(!stamp._isoRegExp){
                stamp._isoRegExp =
//TODO: could be more restrictive and check for 00-59, etc.
                        /^(?:(\d{4})(?:-(\d{2})(?:-(\d{2}))?)?)?(?:T(\d{2}):(\d{2})(?::(\d{2})(.\d+)?)?((?:[+-](\d{2}):(\d{2}))|Z)?)?$/;
        }

        var match = stamp._isoRegExp.exec(formattedString),
                result = null;

        if(match){
                match.shift();
                if(match[1]){match[1]--;} // Javascript Date months are 0-based
                if(match[6]){match[6] *= 1000;} // Javascript Date expects fractional seconds as milliseconds

                if(defaultTime){
                        // mix in defaultTime.  Relatively expensive, so use || operators for the fast path of defaultTime === 0
                        defaultTime = new Date(defaultTime);
                        array.forEach(array.map(["FullYear", "Month", "Date", "Hours", "Minutes", "Seconds", "Milliseconds"], function(prop){
                                return defaultTime["get" + prop]();
                        }), function(value, index){
                                match[index] = match[index] || value;
                        });
                }
                result = new Date(match[0]||1970, match[1]||0, match[2]||1, match[3]||0, match[4]||0, match[5]||0, match[6]||0); //TODO: UTC defaults
                if(match[0] < 100){
                        result.setFullYear(match[0] || 1970);
                }

                var offset = 0,
                        zoneSign = match[7] && match[7].charAt(0);
                if(zoneSign != 'Z'){
                        offset = ((match[8] || 0) * 60) + (Number(match[9]) || 0);
                        if(zoneSign != '-'){ offset *= -1; }
                }
                if(zoneSign){
                        offset -= result.getTimezoneOffset();
                }
                if(offset){
                        result.setTime(result.getTime() + offset * 60000);
                }
        }

        return result; // Date or null
};

/*=====
var __Options = {
        // selector: String
        //              "date" or "time" for partial formatting of the Date object.
        //              Both date and time will be formatted by default.
        // zulu: Boolean
        //              if true, UTC/GMT is used for a timezone
        // milliseconds: Boolean
        //              if true, output milliseconds
};
=====*/

stamp.toISOString = function(/*Date*/ dateObject, /*__Options?*/ options){
        // summary:
        //              Format a Date object as a string according a subset of the ISO-8601 standard
        //
        // description:
        //              When options.selector is omitted, output follows [RFC3339](http://www.ietf.org/rfc/rfc3339.txt)
        //              The local time zone is included as an offset from GMT, except when selector=='time' (time without a date)
        //              Does not check bounds.  Only years between 100 and 9999 are supported.
        //
        // dateObject:
        //              A Date object

        var _ = function(n){ return (n < 10) ? "0" + n : n; };
        options = options || {};
        var formattedDate = [],
                getter = options.zulu ? "getUTC" : "get",
                date = "";
        if(options.selector != "time"){
                var year = dateObject[getter+"FullYear"]();
                date = ["0000".substr((year+"").length)+year, _(dateObject[getter+"Month"]()+1), _(dateObject[getter+"Date"]())].join('-');
        }
        formattedDate.push(date);
        if(options.selector != "date"){
                var time = [_(dateObject[getter+"Hours"]()), _(dateObject[getter+"Minutes"]()), _(dateObject[getter+"Seconds"]())].join(':');
                var millis = dateObject[getter+"Milliseconds"]();
                if(options.milliseconds){
                        time += "."+ (millis < 100 ? "0" : "") + _(millis);
                }
                if(options.zulu){
                        time += "Z";
                }else if(options.selector != "time"){
                        var timezoneOffset = dateObject.getTimezoneOffset();
                        var absOffset = Math.abs(timezoneOffset);
                        time += (timezoneOffset > 0 ? "-" : "+") +
                                _(Math.floor(absOffset/60)) + ":" + _(absOffset%60);
                }
                formattedDate.push(time);
        }
        return formattedDate.join('T'); // String
};

return stamp;
});