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// Copyright 2009 Google Inc. All Rights Reserved.
var RFC822Date = {};
/**
* Return a DateTime in RFC822 format.
* @see http://www.w3.org/Protocols/rfc822/#z28
* @param {Date} date A Date object.
* @param {string} opt_tzo The timezone offset.
*/
RFC822Date.format = function(date, opt_tzo) {
var tzo = opt_tzo || RFC822Date.getTZO(date.getTimezoneOffset());
var rfc822Date = RFC822Date.DAYS[date.getDay()] + ', ';
rfc822Date += RFC822Date.padZero(date.getDate()) + ' ';
rfc822Date += RFC822Date.MONTHS[date.getMonth()] + ' ';
rfc822Date += date.getFullYear() + ' ';
rfc822Date += RFC822Date.padZero(date.getHours()) + ':';
rfc822Date += RFC822Date.padZero(date.getMinutes()) + ':';
rfc822Date += RFC822Date.padZero(date.getSeconds()) + ' ' ;
rfc822Date += tzo;
return rfc822Date;
};
/**
* @type {Array}
*/
RFC822Date.MONTHS = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
/**
* @type {Array}
*/
RFC822Date.DAYS = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
/**
* Pads a value with a 0 if it is less than 10;
* @param {number|string}
* @return {string}
*/
RFC822Date.padZero = function(val) {
val = val + ''; // cast into string
if (val.length < 2) {
val = '0' + val;
}
return val;
};
/**
* Returns a timezone offset in the format +|-dddd.
* @param {String} tzo A time zone offset from GMT in minutes.
* @return {string} The time zone offset as a string.
*/
RFC822Date.getTZO = function(tzo) {
var hours = Math.floor(tzo / 60);
var tzoFormatted = hours > 0 ? '-' : '+';
var absoluteHours = Math.abs(hours);
tzoFormatted += absoluteHours < 10 ? '0' : '';
tzoFormatted += absoluteHours;
var moduloMinutes = Math.abs(tzo % 60);
tzoFormatted += moduloMinutes == 0 ? '00' : moduloMinutes
return tzoFormatted;
};
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