68767bcba9bef048a15a99a862db8bc487229f17.svn-base
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/* Copyright (c) 2006-2011 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* Namespace: OpenLayers.Date
* Contains implementations of Date.parse and date.toISOString that match the
* ECMAScript 5 specification for parsing RFC 3339 dates.
* http://tools.ietf.org/html/rfc3339
*/
OpenLayers.Date = {
/**
* APIMethod: toISOString
* Generates a string representing a date. The format of the string follows
* the profile of ISO 8601 for date and time on the Internet (see
* http://tools.ietf.org/html/rfc3339). If the toISOString method is
* available on the Date prototype, that is used. The toISOString
* method for Date instances is defined in ECMA-262.
*
* Parameters:
* date - {Date} A date object.
*
* Returns:
* {String} A string representing the date (e.g.
* "2010-08-07T16:58:23.123Z"). If the date does not have a valid time
* (i.e. isNaN(date.getTime())) this method returns the string "Invalid
* Date". The ECMA standard says the toISOString method should throw
* RangeError in this case, but Firefox returns a string instead. For
* best results, use isNaN(date.getTime()) to determine date validity
* before generating date strings.
*/
toISOString: (function() {
if ("toISOString" in Date.prototype) {
return function(date) {
return date.toISOString();
};
} else {
function pad(num, len) {
var str = num + "";
while (str.length < len) {
str = "0" + str;
}
return str;
}
return function(date) {
var str;
if (isNaN(date.getTime())) {
// ECMA-262 says throw RangeError, Firefox returns
// "Invalid Date"
str = "Invalid Date";
} else {
str =
date.getUTCFullYear() + "-" +
pad(date.getUTCMonth() + 1, 2) + "-" +
pad(date.getUTCDate(), 2) + "T" +
pad(date.getUTCHours(), 2) + ":" +
pad(date.getUTCMinutes(), 2) + ":" +
pad(date.getUTCSeconds(), 2) + "." +
pad(date.getUTCMilliseconds(), 3) + "Z";
}
return str;
};
}
})(),
/**
* APIMethod: parse
* Generate a date object from a string. The format for the string follows
* the profile of ISO 8601 for date and time on the Internet (see
* http://tools.ietf.org/html/rfc3339). We don't call the native
* Date.parse because of inconsistency between implmentations. In
* Chrome, calling Date.parse with a string that doesn't contain any
* indication of the timezone (e.g. "2011"), the date is interpreted
* in local time. On Firefox, the assumption is UTC.
*
* Parameters:
* str - {String} A string representing the date (e.g.
* "2010", "2010-08", "2010-08-07", "2010-08-07T16:58:23.123Z",
* "2010-08-07T11:58:23.123-06").
*
* Returns:
* {Date} A date object. If the string could not be parsed, an invalid
* date is returned (i.e. isNaN(date.getTime())).
*/
parse: function(str) {
var date;
var match = str.match(/^(?:(\d{4})(?:-(\d{2})(?:-(\d{2}))?)?)?(?:T(\d{1,2}):(\d{2}):(\d{2}(?:\.\d+)?)(Z|(?:[+-]\d{1,2}(?::(\d{2}))?)))?$/);
if (match && (match[1] || match[7])) { // must have at least year or time
var year = parseInt(match[1], 10) || 0;
var month = (parseInt(match[2], 10) - 1) || 0;
var day = parseInt(match[3], 10) || 1;
date = new Date(Date.UTC(year, month, day));
// optional time
var type = match[7];
if (type) {
var hours = parseInt(match[4], 10);
var minutes = parseInt(match[5], 10);
var secFrac = parseFloat(match[6]);
var seconds = secFrac | 0;
var milliseconds = Math.round(1000 * (secFrac - seconds));
date.setUTCHours(hours, minutes, seconds, milliseconds);
// check offset
if (type !== "Z") {
var hoursOffset = parseInt(type, 10);
var minutesOffset = parseInt(match[8], 10) || 0;
var offset = -1000 * (60 * (hoursOffset * 60) + minutesOffset * 60);
date = new Date(date.getTime() + offset);
}
}
} else {
date = new Date("invalid");
}
return date;
}
};