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strftime.js
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strftime.js
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//
// strftime
// github.com/samsonjs/strftime
// @_sjs
//
// Copyright 2010 - 2013 Sami Samhuri <sami@samhuri.net>
//
// zh-CN locale By michaeljayt<michaeljayt@gmail.com>
//
// MIT License
// http://sjs.mit-license.org
//
;(function() {
//// Where to export the API
var namespace;
// CommonJS / Node module
if (typeof module !== 'undefined') {
namespace = module.exports = strftime;
}
// Browsers and other environments
else {
// Get the global object. Works in ES3, ES5, and ES5 strict mode.
namespace = (function(){ return this || (1,eval)('this') }());
}
function words(s) { return (s || '').split(' '); }
var DefaultLocale =
{ days: words('星期日 星期一 星期二 星期三 星期四 星期五 星期六')
, shortDays: words('日 一 二 三 四 五 六')
, months: words('一月份 二月份 三月份 四月份 五月份 六月份 七月份 八月份 九月份 十月份 十一月份 十二月份')
, shortMonths: words('一月 二月 三月 四月 五月 六月 七月 八月 九月 十月 十一月 十二月')
, AM: '上午'
, PM: '下午'
, am: '上午'
, pm: '下午'
};
namespace.strftime = strftime;
function strftime(fmt, d, locale) {
return _strftime(fmt, d, locale);
}
// locale is optional
namespace.strftimeTZ = strftime.strftimeTZ = strftimeTZ;
function strftimeTZ(fmt, d, locale, timezone) {
if (typeof locale == 'number' && timezone == null) {
timezone = locale;
locale = undefined;
}
return _strftime(fmt, d, locale, { timezone: timezone });
}
namespace.strftimeUTC = strftime.strftimeUTC = strftimeUTC;
function strftimeUTC(fmt, d, locale) {
return _strftime(fmt, d, locale, { utc: true });
}
namespace.localizedStrftime = strftime.localizedStrftime = localizedStrftime;
function localizedStrftime(locale) {
return function(fmt, d, options) {
return strftime(fmt, d, locale, options);
};
}
// d, locale, and options are optional, but you can't leave
// holes in the argument list. If you pass options you have to pass
// in all the preceding args as well.
//
// options:
// - locale [object] an object with the same structure as DefaultLocale
// - timezone [number] timezone offset in minutes from GMT
function _strftime(fmt, d, locale, options) {
options = options || {};
// d and locale are optional so check if d is really the locale
if (d && !quacksLikeDate(d)) {
locale = d;
d = undefined;
}
d = d || new Date();
locale = locale || DefaultLocale;
locale.formats = locale.formats || {};
// Hang on to this Unix timestamp because we might mess with it directly below.
var timestamp = d.getTime();
if (options.utc || typeof options.timezone == 'number') {
d = dateToUTC(d);
}
if (typeof options.timezone == 'number') {
d = new Date(d.getTime() + (options.timezone * 60000));
}
// Most of the specifiers supported by C's strftime, and some from Ruby.
// Some other syntax extensions from Ruby are supported: %-, %_, and %0
// to pad with nothing, space, or zero (respectively).
return fmt.replace(/%([-_0]?.)/g, function(_, c) {
var mod, padding;
if (c.length == 2) {
mod = c[0];
// omit padding
if (mod == '-') {
padding = '';
}
// pad with space
else if (mod == '_') {
padding = ' ';
}
// pad with zero
else if (mod == '0') {
padding = '0';
}
else {
// unrecognized, return the format
return _;
}
c = c[1];
}
switch (c) {
case 'A': return locale.days[d.getDay()];
case 'a': return locale.shortDays[d.getDay()];
case 'B': return locale.months[d.getMonth()];
case 'b': return locale.shortMonths[d.getMonth()];
case 'C': return pad(Math.floor(d.getFullYear() / 100), padding);
case 'D': return _strftime(locale.formats.D || '%m/%d/%y', d, locale);
case 'd': return pad(d.getDate(), padding);
case 'e': return d.getDate();
case 'F': return _strftime(locale.formats.F || '%Y-%m-%d', d, locale);
case 'H': return pad(d.getHours(), padding);
case 'h': return locale.shortMonths[d.getMonth()];
case 'I': return pad(hours12(d), padding);
case 'j':
var y = new Date(d.getFullYear(), 0, 1);
var day = Math.ceil((d.getTime() - y.getTime()) / (1000 * 60 * 60 * 24));
return pad(day, 3);
case 'k': return pad(d.getHours(), padding == null ? ' ' : padding);
case 'L': return pad(Math.floor(timestamp % 1000), 3);
case 'l': return pad(hours12(d), padding == null ? ' ' : padding);
case 'M': return pad(d.getMinutes(), padding);
case 'm': return pad(d.getMonth() + 1, padding);
case 'n': return '\n';
case 'o': return String(d.getDate()) + ordinal(d.getDate());
case 'P': return d.getHours() < 12 ? locale.am : locale.pm;
case 'p': return d.getHours() < 12 ? locale.AM : locale.PM;
case 'R': return _strftime(locale.formats.R || '%H:%M', d, locale);
case 'r': return _strftime(locale.formats.r || '%I:%M:%S %p', d, locale);
case 'S': return pad(d.getSeconds(), padding);
case 's': return Math.floor(timestamp / 1000);
case 'T': return _strftime(locale.formats.T || '%H:%M:%S', d, locale);
case 't': return '\t';
case 'U': return pad(weekNumber(d, 'sunday'), padding);
case 'u':
var day = d.getDay();
return day == 0 ? 7 : day; // 1 - 7, Monday is first day of the week
case 'v': return _strftime(locale.formats.v || '%e-%b-%Y', d, locale);
case 'W': return pad(weekNumber(d, 'monday'), padding);
case 'w': return d.getDay(); // 0 - 6, Sunday is first day of the week
case 'Y': return d.getFullYear();
case 'y':
var y = String(d.getFullYear());
return y.slice(y.length - 2);
case 'Z':
if (options.utc) {
return "GMT";
}
else {
var tz = d.toString().match(/\((\w+)\)/);
return tz && tz[1] || '';
}
case 'z':
if (options.utc) {
return "+0000";
}
else {
var off = typeof options.timezone == 'number' ? options.timezone : -d.getTimezoneOffset();
return (off < 0 ? '-' : '+') + pad(Math.abs(off / 60)) + pad(off % 60);
}
default: return c;
}
});
}
function dateToUTC(d) {
var msDelta = (d.getTimezoneOffset() || 0) * 60000;
return new Date(d.getTime() + msDelta);
}
var RequiredDateMethods = ['getTime', 'getTimezoneOffset', 'getDay', 'getDate', 'getMonth', 'getFullYear', 'getYear', 'getHours', 'getMinutes', 'getSeconds'];
function quacksLikeDate(x) {
var i = 0
, n = RequiredDateMethods.length
;
for (i = 0; i < n; ++i) {
if (typeof x[RequiredDateMethods[i]] != 'function') {
return false;
}
}
return true;
}
// Default padding is '0' and default length is 2, both are optional.
function pad(n, padding, length) {
// pad(n, <length>)
if (typeof padding === 'number') {
length = padding;
padding = '0';
}
// Defaults handle pad(n) and pad(n, <padding>)
if (padding == null) {
padding = '0';
}
length = length || 2;
var s = String(n);
// padding may be an empty string, don't loop forever if it is
if (padding) {
while (s.length < length) s = padding + s;
}
return s;
}
function hours12(d) {
var hour = d.getHours();
if (hour == 0) hour = 12;
else if (hour > 12) hour -= 12;
return hour;
}
// Get the ordinal suffix for a number: st, nd, rd, or th
function ordinal(n) {
var i = n % 10
, ii = n % 100
;
if ((ii >= 11 && ii <= 13) || i === 0 || i >= 4) {
return 'th';
}
switch (i) {
case 1: return 'st';
case 2: return 'nd';
case 3: return 'rd';
}
}
// firstWeekday: 'sunday' or 'monday', default is 'sunday'
//
// Pilfered & ported from Ruby's strftime implementation.
function weekNumber(d, firstWeekday) {
firstWeekday = firstWeekday || 'sunday';
// This works by shifting the weekday back by one day if we
// are treating Monday as the first day of the week.
var wday = d.getDay();
if (firstWeekday == 'monday') {
if (wday == 0) // Sunday
wday = 6;
else
wday--;
}
var firstDayOfYear = new Date(d.getFullYear(), 0, 1)
, yday = (d - firstDayOfYear) / 86400000
, weekNum = (yday + 7 - wday) / 7
;
return Math.floor(weekNum);
}
}());