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datef.js
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datef.js
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(function () {
'use strict';
/**
* Converts <code>value</code> to string and pad it with leading zeroes until resulting string reaches <code>length</code>
* @param {Number} value
* @param {Number} [length=2]
* @return {String}
*/
function leadingZeroes(value, length) {
var str = value.toString(),
finalLen = arguments.length == 2 ? length : 2;
if (str.length > finalLen) {
return str;
}
// this task can be accomplished in one line — empty for cycle
for (str; str.length < finalLen; str = '0' + str);
return str;
}
var tokens = {
YYYY: function (date) {
return date.getFullYear();
},
YY: function (date) {
return leadingZeroes(date.getFullYear() % 100);
},
MM: function (date) {
return leadingZeroes(date.getMonth() + 1);
},
M: function (date) {
return date.getMonth() + 1;
},
dd: function (date) {
return leadingZeroes(date.getDate());
},
d: function (date) {
return date.getDate();
},
hh: function (date) {
return leadingZeroes(date.getHours());
},
h: function (date) {
return date.getHours();
},
mm: function (date) {
return leadingZeroes(date.getMinutes());
},
m: function (date) {
return date.getMinutes();
},
ss: function (date) {
return leadingZeroes(date.getSeconds());
},
s: function (date) {
return date.getSeconds();
},
Z: function (date) {
var tz = date.getTimezoneOffset(),
hours = Math.abs(Math.floor(tz / 60)),
mins = tz % 60,
sign = tz > 0 ? '+' : '-';
return [sign, leadingZeroes(hours), ':', leadingZeroes(mins)].join('');
}
};
var possibleFormats = [];
for (var extractor in tokens) {
if (tokens.hasOwnProperty(extractor)) {
possibleFormats.push(extractor)
}
}
var regexp = new RegExp(possibleFormats.join('|'), 'mg');
/**
* Formats date according to <b>format</b> string.
* Format string may consist of any characters, but some of them considered tokens,
* and will be replaced by appropriate value from <b>date</b>.
* Possible tokens include:
* <b>YYYY</b>: 4-digit year
* <b>YY</b>: last 2 digit of year
* <b>MM</b>: ISO8601-compatible number of month (i.e. zero-padded) in year (with January being 1st month)
* <b>M</b>: number of month in year without zero-padding (with January being 1st month)
* <b>dd</b>: zero-padded number of day in month
* <b>d</b>: number of day in month
* <b>hh</b>: zero-padded hour
* <b>h</b>: hour
* <b>mm</b>: zero-padded minutes
* <b>m</b>: minutes
* <b>ss</b>: zero-padded seconds
* <b>s</b>: seconds
* <b>TZ</b>: time-zone in ISO8601-compatible format (i.e. "-04:00")
*
* Longer tokens take precedence over shorter ones (so "MM" will aways be "04", not "44" in april).
*
* @param {String} format
* @param {Date|Number} [date=Date.now()]
* @return {String}
*/
function datef (format, date) {
var dt = (arguments.length === 2 && date) ? new Date(date) : new Date(),
result = new String(format);
return result.replace(regexp, function (match) {
return tokens[match](dt);
});
};
/**
* Creates formatting function. Basically just curry over datef.
* @return {Function} readied formatting function with one argument — date.
*/
var createFormatter = datef.createFormatter = function (format) {
return function (date) {
return datef(format, date)
}
};
/**
* Predefined formatters storage.
* @type {Object}
*/
var formatters = datef.formatters = {};
/**
* Creates formatting function and files it under <code>datef.formatters[name]</code>
* @param {String} name
* @param {String} format
* @return {Function} readied formatting function with one argument — date.
*/
var register = datef.register = function (name, format) {
return formatters[name] = createFormatter(format)
};
// Let's create some basic formats
register('ISODate', 'YYYY-MM-dd');
register('ISOTime', 'hh:mm:ss');
register('ISODateTime', 'YYYY-MM-ddThh:mm:ss');
register('ISODateTimeTZ', 'YYYY-MM-ddThh:mm:ss Z');
// get reference to global object
var root;
if (typeof window !== 'undefined') { // we're in browser, captain!
root = window
} else if (typeof global !== 'undefined') { // node.js
root = global;
}
else {
root = this;
}
// conflict management — save link to previous content of datef, whatever it was.
var prevDatef = root.datef;
/**
* Cleans global namespace, restoring previous value of window.datef, and returns datef itself.
* @return {datef}
*/
datef.noConflict = function () {
root.datef = prevDatef;
return this;
};
// Expose our precious function to outer world.
if (typeof exports !== 'undefined') { // node.js way
module.exports.datef = datef;
} else if (typeof define === 'function' && define.amd) { // requirejs/amd env
define(
'datef',
[],
function () {
return datef;
}
);
} else { // plain browser environment
root.datef = datef;
}
})();