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dateutil.js
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dateutil.js
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/*
* Dateutil
* - provides formatting, parsing and other utility functions for dates.
*
* Copyright (c) 2009 Borgar Þorsteinsson
* Licensed under the terms of the MIT (LICENSE.txt) software license.
*
*/
/*jslint laxbreak: true, undef: true *//*global module */
(function(__global__){
var SECOND_SIZE = 1000;
var MINUTE_SIZE = SECOND_SIZE * 60;
var HOUR_SIZE = MINUTE_SIZE * 60;
var DAY_SIZE = HOUR_SIZE * 24;
var WEEK_SIZE = DAY_SIZE * 7;
var MONTH_SIZE = DAY_SIZE * 30.436875; // average month size
var YEAR_SIZE = DAY_SIZE * 365.2425; // average year size
var _toString = Object.prototype.toString;
var _gl = __global__.lang = { 'en': {} };
var _m = 'January February March April May June July August September October November December'.split(' ');
var _d = 'Sunday Monday Tuesday Wednesday Thursday Friday Saturday'.split(' ');
var method_size = {
'FullYear': 6, 'Month': 5, 'Date': 4, 'Hours': 3,
'Minutes': 2, 'Seconds': 1, 'Milliseconds': 0
};
var method_map = {
'yr': 'FullYear',
'year': 'FullYear',
'years': 'FullYear',
'mn': 'Month',
'month': 'Month',
'months': 'Month',
'day': 'Date',
'days': 'Date',
'date': 'Date',
'hr': 'Hours',
'hour': 'Hours',
'hours': 'Hours',
'min': 'Minutes',
'minute': 'Minutes',
'minutes': 'Minutes',
'sec': 'Seconds',
'second': 'Seconds',
'seconds': 'Seconds',
'ms': 'Milliseconds',
'millisecond': 'Milliseconds',
'milliseconds': 'Milliseconds'
};
// *****************************************
// *** *** *** formats & parsers *** *** ***
// *****************************************
var date_parsers = __global__._parsers = {
// year + month + day + time
// -- currently doesn't really support fractions on anything other than seconds >> FIXME
// -- does not support timezones other than Zulu
date_and_time: {
test: /^(?:[+\-]\d{6}|\d{4})(?:(?:\-\d\d){1,2}|\d{4})[T ](?:\d\d)(?::?\d\d){0,2}(?:[\.,]\d+)?(?:Z|[+\-]\d\d(:?\d\d)?)?$/,
size: 1,
parse: function ( str ) {
var b = str.split( /[T ]/ );
var date = date_parsers.date.parse( b[0] );
var m = b[1].replace( /:/g, '' )
.match( /^(\d\d)(\d\d)?(\d\d)?(?:[.,](\d+))?([+\-](?:\d\d){1,2})?/ );
// TODO: timezone (I have no need for this feature yet)
// if ( m[5] ) { var zone = m[5] || '0000'; }
var fs = 0, t = date.getTime() +
parseInt( m[1], 10 ) * HOUR_SIZE +
parseInt( m[2] || '0', 10 ) * MINUTE_SIZE +
parseInt( m[3] || '0', 10 ) * SECOND_SIZE;
if ( m[3] ) { fs = SECOND_SIZE; }
else if ( m[2] ) { fs = MINUTE_SIZE; }
else if ( m[1] ) { fs = HOUR_SIZE; }
t += parseFloat( '0.' + ( m[4] || '0' ) ) * fs;
date.setTime( t );
date.size = 0;
return date;
}
},
// year + month + day
date: {
test: /^(?:[+\-]\d{6}|\d{4})(?:\-\d\d\-\d\d|\-?\d\d\d\d)$/,
size: DAY_SIZE,
parse: function ( str ) {
var m = /^([+\-]\d{6}|\d{4})\-?(\d\d)\-?(\d\d)$/.exec( str ),
d = __global__.date( m[1], +m[2] -1, m[3] );
d.size = DAY_SIZE;
return d;
}
},
// year + month
year_and_month: {
test: /^[+\-]?\d{4,6}[\/\-](?:0[1-9]|1[012])$/,
size: MONTH_SIZE,
parse: function ( str ) {
var b = str.split( /[\/\-]/ );
var d = __global__.date( b[0], +b[1] - 1, 1 );
d.size = __global__.daysInMonth( d ) * DAY_SIZE;
return d;
}
},
// year
year: {
test: /^[+\-]?\d{4,6}$/,
size: YEAR_SIZE,
parse: function ( str ) {
var d = __global__.date( str, 0, 1 );
d.size = DAY_SIZE * ( __global__.isLeapYear( d ) ? 366 : 365 );
return d;
}
},
// year + iso week + [day]
year_and_week: {
test: /^[+\-]?\d{4,6}\-?[Ww]\d\d(?:\-?\d)?$/,
size: WEEK_SIZE,
parse: function ( str ) {
var s = str.toLowerCase().replace( /[^w\d]/g, '' ).split('w');
var d = __global__.date( s[0], 0, 3 ); // Jan 3
d.setUTCDate( 3 - d.getUTCDay() +
( parseInt( s[1].substr( 0, 2 ), 10 ) - 1 ) * 7 +
parseInt( s[1].substr( 2, 1 ) || '1', 10 ) );
d.size = WEEK_SIZE;
return d;
}
},
// year + day-of-year
// -- we don't allow the short form yyyyddd because of ambiguity with yyyymmdd
// -- 5 letter years would clash with cal-dates: yyyyyddd ~ yyyymmdd
year_and_ordinal: {
test: /^[+\-]?\d{4,6}\-[0-3]\d\d$/,
size: DAY_SIZE,
parse: function ( str ) {
var d = new Date(0);
d.setUTCFullYear( parseInt( str.substr(0,str.length-4), 10 ) );
d.setDate( parseInt( str.substr(str.length-3), 10 ) );
d.size = DAY_SIZE;
return d;
}
},
// year + quarter
year_and_quarter: {
test: /^[+\-]?\d{4,6}\-?[Qq][1-4]$/,
size: YEAR_SIZE / 4,
parse: function ( str ) {
var b = str.split(/\-?[Qq]/),
d = __global__.date( b[0], ( parseInt( b[1], 10 ) - 1 ) * 3 );
d.size = DAY_SIZE;
return d;
}
}
};
var date_formatters = __global__._formats = {
// Lowercase Ante meridiem and Post meridiem
a: function (d) { return d.getUTCHours() >= 12 ? 'pm' : 'am'; },
// Uppercase Ante meridiem and Post meridiem
A: function (d) { return d.getUTCHours() >= 12 ? 'PM' : 'AM'; },
// ISO 8601 date
c: function (d,l) { return __global__.isoyear( d ) +
__global__.format( d, '-m-d\\TH:i:s.', l ) +
__global__.pad( d.getUTCMilliseconds(), 3 ) + 'Z'; },
// Day of the month, 2 digits with leading zeros
d: function (d) { return __global__.pad( d.getUTCDate() ); },
// A textual representation of a day, three letters
D: function (d,l) { return __global__._( _d[ d.getUTCDay() ].substr( 0, 3 ), l ); },
// Time zone identifier
e: function (d) { return 'UTC'; },
// A full textual representation of a month
F: function (d,l) { return __global__._( _m[ d.getUTCMonth() ], l ); },
// 12-hour format of an hour without leading zeros
g: function (d) { return d.getUTCHours() % 12 || 12; },
// 24-hour format of an hour without leading zeros
G: function (d) { return d.getUTCHours(); },
// 12-hour format of an hour with leading zeros
h: function (d) { return __global__.pad( d.getUTCHours() % 12 || 12 ); },
// 24-hour format of an hour with leading zeros
H: function (d) { return __global__.pad( d.getUTCHours() ); },
// Minutes with leading zeros
i: function (d) { return __global__.pad( d.getUTCMinutes() ); },
// Day of the month without leading zeros
j: function (d) { return d.getUTCDate(); },
// A full textual representation of the day of the week
l: function (d,l) { return __global__._( _d[ d.getUTCDay() ], l ); },
// Whether it's a leap year (0 = yes, 1 = no)
L: function (d) { return __global__.isLeapYear( d ) * 1; },
// Numeric representation of a month, with leading zeros
m: function (d) { return __global__.pad( d.getUTCMonth() + 1 ); },
// A short textual representation of a month, three letters
M: function (d,l) { return __global__._( _m[ d.getUTCMonth() ].substr( 0, 3 ), l ); },
// Numeric representation of a month, without leading zeros
n: function (d) { return d.getUTCMonth() + 1; },
// ISO-8601 numeric representation of the day of the week
N: function (d) { return d.getUTCDay() || 7; },
// ISO-8601 year number
o: function (d) { return __global__.pad( __global__.isocalendar(d)[0], 4 ); },
// Time zone designator
O: function (d) { return '+0000'; },
// Time zone difference
P: function (d) { return '+00:00'; },
// Quarter of the year
q: function (d) { return ~~( d.getUTCMonth() / 3 ) + 1; },
// RFC 2822 formatted date
r: function (d,l) { return __global__.format( d, 'D, d M Y H:i:s O', l ); },
// Seconds, with leading zeros
s: function (d) { return __global__.pad( d.getUTCSeconds() ); },
// English ordinal suffix for the day of the month, 2 characters
S: function (d) {
var a = d.getUTCDate() % 10, b = d.getUTCDate() % 100;
return (a === 1) && (b !== 11) && 'st' ||
(a === 2) && (b !== 12) && 'nd' ||
(a === 3) && (b !== 13) && 'rd' || 'th';
},
// Number of days in the given month
t: function (d) { return __global__.daysInMonth( d ); },
// Time zone abbreviation
T: function (d) { return 'UTC'; },
// Microseconds
u: function (d) { return __global__.pad( d.getUTCMilliseconds(), 6 ); },
// Seconds since the Unix Epoch
U: function (d) { return ~~( d / 1000 ); },
// Numeric representation of the day of the week
w: function (d) { return d.getUTCDay(); },
// ISO-8601 week number of year, weeks starting on Monday
W: function (d) { return __global__.pad( __global__.isocalendar(d)[1] ); },
// A short numeric representation of a year, 2 digits
y: function (d) { return (d.getUTCFullYear() + '').substr(2); },
// A full numeric representation of a year, 4 digits
Y: function (d) { return d.getUTCFullYear(); },
// The day of the year (starting from 0)
z: function (d) { return Math.floor( ( d - (new Date(Date.UTC(d.getUTCFullYear(), 0, 1))) ) / DAY_SIZE ); }
};
// **************************************
// *** *** *** module methods *** *** ***
// **************************************
__global__.date = function ( y, m, d, h, n, s, ms ) {
if ( !arguments.length ) { return new Date(__global__.now()); }
y = parseInt( y || 0, 10 );
if ( arguments.length === 1 ) { return new Date(y); }
var ts = Date.UTC( y, parseInt( m||0, 10 ), parseInt( d||1, 10 ),
parseInt( h||0, 10 ), parseInt( n||0, 10 ), parseInt( s||0, 10 ),
parseInt( ms||0, 10 ) );
var d = new Date( ts );
if ( y < 100 && y >= 0 ) { // JS date ranges 0-99 are interpreted by Date.UTC as 1900-1999
d.setUTCFullYear( y );
}
return d;
};
// zero pad a string n to l places
__global__.pad = function ( n, l ) {
var s = __global__.pad.z;
if ( !s ) { // This mess is here because JSlint breaks on new Array(999)
var a = []; a[999] = '';
s = __global__.pad.z = a.join('0');
}
s += n;
return s.substring( s.length -( l || 2 ) );
};
// is a given year a leap year
__global__.isLeapYear = function ( y ) {
if ( _toString.call( y ) === '[object Date]' ) { y = y.getUTCFullYear(); }
return (( y % 4 === 0 ) && ( y % 100 !== 0 )) || ( y % 400 === 0 );
};
// return the number of days in a date's month
__global__.daysInMonth = function ( dt ) {
var m = dt.getUTCMonth();
if ( m === 1 ) {
return __global__.isLeapYear( dt ) ? 29 : 28;
}
return [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ][ m ];
};
// return a 3-tuple, (ISO year, ISO week number, ISO weekday).
__global__.isocalendar = function ( dt ) {
var d = dt.getUTCDay();
var t = new Date( dt.valueOf() );
t.setDate( t.getDate() - ((d + 6) % 7) + 3 );
var iso_year = t.getUTCFullYear();
var w = Math.floor( (t.getTime() - __global__.date(iso_year, 0, 1, -6)) / 86400000 );
return [ iso_year, 1+Math.floor(w/7), d||7 ];
};
__global__.isoyear = function ( dt ) {
var y = dt.getUTCFullYear();
if ( y >= 0 && y <= 9999 ) {
return __global__.pad( Math.abs(y), 4 );
}
return ( (y<0) ? '-' : '+' ) + __global__.pad( Math.abs(y), 6 );
}
// Allow setting multiple properties at once using object notation:
// `mydate.set({ hour: 8, minute: 12, second: 0 });`
__global__.set = function ( dt, values ) {
if ( typeof values === 'object' ) {
var s = [], n, i;
// step 1: collect a list of values to modify
for ( var key in values ) {
if ( key in method_map ) {
n = method_map[ key ];
s.push( [ values[ key ], n, method_size[ n ] ] );
}
}
// step 2: order values by size
s = s.sort(function ( a, b ) { return a[2] - b[2]; });
// step 3: little endian value zeroing
for (i=0; i<s.length; i++) {
dt[ 'setUTC' + s[i][1] ]( s[i][1] === 'Date' ? 1 : 0 );
}
// step 4: big endian value setting
for (i=s.length; i--; ) {
dt[ 'setUTC' + s[i][1] ]( s[i][0] );
}
}
return dt;
};
// parse a date
__global__.parse = function ( str ) {
var d;
if ( typeof str !== 'string' ) {
throw new Error( "dateutil parser can't parse non-strings." );
}
for ( var dtype in date_parsers ) {
if ( date_parsers[dtype].test.test( str ) ) {
d = date_parsers[ dtype ].parse( str );
d.type = dtype;
d.size = d.size || 0;
break;
}
}
// default parser supports RFC and a few more, or returns an "invalid date"
if ( !d ) {
d = new Date( str );
d.size = 0;
d.type = 'unknown_date';
}
return d;
};
// format a date to string
__global__.format = function ( d, fmt, lang ) {
// has been moved to the Date prototype?
if ( _toString.call( this ) === '[object Date]' ) {
lang = fmt;
fmt = d;
d = this;
}
else if ( _toString.call( d ) !== '[object Date]' ) {
throw new Error( 'No date passed to format.' );
}
for ( var r=[], c, l=fmt.length, i=0; i<l; i++ ) {
c = fmt.charAt( i );
// format characters
if ( c !== '\\' ) {
r.push( (c in date_formatters) ? date_formatters[ c ]( d, lang ) : c );
}
// escaped characters & unreconized characters
else {
c = i < fmt.length ? fmt.charAt( ++i ) : c;
r.push( c );
}
}
return r.join( '' );
};
// return a Date object for the current date (0 time)
__global__.today = function () {
return __global__.set( __global__.date(), {
hour: 0, minute: 0, second: 0, millisecond: 0
});
};
// return timestamp for the moment
__global__.now = ( typeof Date.now === 'function' )
? Date.now
: function () { return +new Date(); };
// translation hook
__global__._ = function ( s, lang ) {
var l = lang && __global__.lang[ lang ];
return ( l && s in l ) ? l[s] : s;
};
}(
(typeof module !== 'undefined' && module.exports)
? module.exports
: (this.dateutil = {})
));