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isoDate.js
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isoDate.js
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//
//ISO Date formatting/parsing implementation
//
// Examples:
// isoDate.parse("1753-01-01T00:00:00Z");
// isoDate.toLocalString(new Date());
// isoDate.toUTCString(new Date());
var isoDate = {
_expression: new RegExp("^" +
"(\\d{4}|[\+\-]\\d{6})" + // four-digit year capture or sign + 6-digit extended year
"(?:-(\\d{2})" + // optional month capture
"(?:-(\\d{2})" + // optional day capture
"(?:" + // capture hours:minutes:seconds.milliseconds
"T(\\d{2})" + // hours capture
":(\\d{2})" + // minutes capture
"(?:" + // optional :seconds.milliseconds
":(\\d{2})" + // seconds capture
"(?:\\.(\\d{3}))?" + // milliseconds capture
")?" +
"(?:" + // capture UTC offset component
"Z|" + // UTC capture
"(?:" + // offset specifier +/-hours:minutes
"([-+])" + // sign capture
"(\\d{2})" + // hours offset capture
":?(\\d{2})" + // minutes offset capture
")" +
")?)?)?)?" +
"$"),
match: function(string) {
return this._expression.exec(string) != null;
},
parse: function(string) {
var match = this._expression.exec(string);
if (match) {
match.shift(); // kill match[0], the full match
// parse months, days, hours, minutes, seconds, and milliseconds
for (var i = 1; i < 7; i++) {
// provide default values if necessary
match[i] = +(match[i] || (i < 3 ? 1 : 0));
// match[1] is the month. Months are 0-11 in JavaScript
// `Date` objects, but 1-12 in ISO notation, so we
// decrement.
if (i == 1) {
match[i]--;
}
}
// parse the UTC offset component
var minuteOffset = +match.pop(), hourOffset = +match.pop(), sign = match.pop();
// compute the explicit time zone offset if specified
var isUtc = string.indexOf("Z") > 0;
var isTzSpecified = sign || isUtc;
var offset = 0;
if (sign) {
// detect invalid offsets and return early
if (hourOffset > 23 || minuteOffset > 59) {
return NaN;
}
// express the provided time zone offset in minutes. The offset is
// negative for time zones west of UTC; positive otherwise.
offset = (hourOffset * 60 + minuteOffset) * 6e4 * (sign == "+" ? -1 : 1);
}
if (isTzSpecified) {
var utc = new Date(1970, 1, 1);
utc.setUTCFullYear(match[0]);
utc.setUTCMonth(match[1]);
utc.setUTCDate(match[2]);
utc.setUTCHours(match[3]);
utc.setUTCMinutes(match[4]);
utc.setUTCSeconds(match[5]);
utc.setUTCMilliseconds(0);
return new Date(utc.getTime() + offset);
} else {
var date = new Date(new Date(1970, 1, 1));
date.setFullYear(match[0]);
date.setMonth(match[1]);
date.setDate(match[2]);
date.setHours(match[3]);
date.setMinutes(match[4]);
date.setSeconds(match[5]);
date.setMilliseconds(0);
return date;
}
}
return NaN;
},
toLocalString: function(date) {
if (date == null || isNaN(date)) { return null; }
var month = date.getMonth() + 1,
day = date.getDate(),
year = date.getFullYear(),
hours = date.getHours(),
minutes = date.getMinutes(),
seconds = date.getSeconds();
if (year < 1000) {
year = ('0000' + year);
year = year.substr(year.length - 4, 4);
}
if (month < 10) {
month = '0' + month;
}
if (day < 10) {
day = '0' + day;
}
if (hours < 10) {
hours = '0' + hours;
}
if (minutes < 10) {
minutes = '0' + minutes;
}
if (seconds < 10) {
seconds = '0' + seconds;
}
return '' + year + '-' + month + '-' + day + 'T' +
hours + ':' + minutes + ':' + seconds;
},
toUTCString: function(date) {
if (date == null || isNaN(date)) { return null; }
var month = date.getUTCMonth() + 1,
day = date.getUTCDate(),
year = date.getUTCFullYear(),
hours = date.getUTCHours(),
minutes = date.getUTCMinutes(),
seconds = date.getUTCSeconds();
if (year < 1000) {
year = ('0000' + year);
year = year.substr(year.length - 4, 4);
}
if (month < 10) {
month = '0' + month;
}
if (day < 10) {
day = '0' + day;
}
if (hours < 10) {
hours = '0' + hours;
}
if (minutes < 10) {
minutes = '0' + minutes;
}
if (seconds < 10) {
seconds = '0' + seconds;
}
return '' + year + '-' + month + '-' + day + 'T' +
hours + ':' + minutes + ':' + seconds + "Z";
}
};