/**
* 模拟PHP的date函数
* eg. date('Y m d', (new Date()).getTime() / 1000)
*
* @Date 2016-12-06
* @param {String} format [需要格式化的样式]
* @param {Number} timestamp [可选，需要格式化的时间戳（秒），默认是当前时间]
* @return {String} [返回格式化后的时间]
*/
function date(format, timestamp) {
var that = this;
var jsdate, f;
// Keep this here (works, but for code commented-out below for file size reasons)
// var tal= [];
var txt_words = [
'Sun', 'Mon', 'Tues', 'Wednes', 'Thurs', 'Fri', 'Satur',
'January', 'February', 'March', 'April', 'May', 'June',
'July', 'August', 'September', 'October', 'November', 'December'
];
// trailing backslash -> (dropped)
// a backslash followed by any character (including backslash) -> the character
// empty string -> empty string
var formatChr = /\\?(.?)/gi;
var formatChrCb = function (t, s) {
return f[t] ? f[t]() : s;
};
var _pad = function (n, c) {
n = String(n);
while (n.length < c) {
n = '0' + n;
}
return n;
};
f = {
// Day
d: function () {
// Day of month w/leading 0; 01..31
return _pad(f.j(), 2);
},
D: function () {
// Shorthand day name; Mon...Sun
return f.l()
.slice(0, 3);
},
j: function () {
// Day of month; 1..31
return jsdate.getDate();
},
l: function () {
// Full day name; Monday...Sunday
return txt_words[f.w()] + 'day';
},
N: function () {
// ISO-8601 day of week; 1[Mon]..7[Sun]
return f.w() || 7;
},
S: function () {
// Ordinal suffix for day of month; st, nd, rd, th
var j = f.j();
var i = j % 10;
if (i <= 3 && parseInt((j % 100) / 10, 10) == 1) {
i = 0;
}
return ['st', 'nd', 'rd'][i - 1] || 'th';
},
w: function () {
// Day of week; 0[Sun]..6[Sat]
return jsdate.getDay();
},
z: function () {
// Day of year; 0..365
var a = new Date(f.Y(), f.n() - 1, f.j());
var b = new Date(f.Y(), 0, 1);
return Math.round((a - b) / 864e5);
},
// Week
W: function () {
// ISO-8601 week number
var a = new Date(f.Y(), f.n() - 1, f.j() - f.N() + 3);
var b = new Date(a.getFullYear(), 0, 4);
return _pad(1 + Math.round((a - b) / 864e5 / 7), 2);
},
// Month
F: function () {
// Full month name; January...December
return txt_words[6 + f.n()];
},
m: function () {
// Month w/leading 0; 01...12
return _pad(f.n(), 2);
},
M: function () {
// Shorthand month name; Jan...Dec
return f.F()
.slice(0, 3);
},
n: function () {
// Month; 1...12
return jsdate.getMonth() + 1;
},
t: function () {
// Days in month; 28...31
return (new Date(f.Y(), f.n(), 0))
.getDate();
},
// Year
L: function () {
// Is leap year?; 0 or 1
var j = f.Y();
return j % 4 === 0 & j % 100 !== 0 | j % 400 === 0;
},
o: function () {
// ISO-8601 year
var n = f.n();
var W = f.W();
var Y = f.Y();
return Y + (n === 12 && W < 9 ? 1 : n === 1 && W > 9 ? -1 : 0);
},
Y: function () {
// Full year; e.g. 1980...2010
return jsdate.getFullYear();
},
y: function () {
// Last two digits of year; 00...99
return f.Y()
.toString()
.slice(-2);
},
// Time
a: function () {
// am or pm
return jsdate.getHours() > 11 ? 'pm' : 'am';
},
A: function () {
// AM or PM
return f.a()
.toUpperCase();
},
B: function () {
// Swatch Internet time; 000..999
var H = jsdate.getUTCHours() * 36e2;
// Hours
var i = jsdate.getUTCMinutes() * 60;
// Minutes
// Seconds
var s = jsdate.getUTCSeconds();
return _pad(Math.floor((H + i + s + 36e2) / 86.4) % 1e3, 3);
},
g: function () {
// 12-Hours; 1..12
return f.G() % 12 || 12;
},
G: function () {
// 24-Hours; 0..23
return jsdate.getHours();
},
h: function () {
// 12-Hours w/leading 0; 01..12
return _pad(f.g(), 2);
},
H: function () {
// 24-Hours w/leading 0; 00..23
return _pad(f.G(), 2);
},
i: function () {
// Minutes w/leading 0; 00..59
return _pad(jsdate.getMinutes(), 2);
},
s: function () {
// Seconds w/leading 0; 00..59
return _pad(jsdate.getSeconds(), 2);
},
u: function () {
// Microseconds; 000000-999000
return _pad(jsdate.getMilliseconds() * 1000, 6);
},
// Timezone
e: function () {
// Timezone identifier; e.g. Atlantic/Azores, ...
// The following works, but requires inclusion of the very large
// timezone_abbreviations_list() function.
/* return that.date_default_timezone_get();
*/
throw 'Not supported (see source code of date() for timezone on how to add support)';
},
I: function () {
// DST observed?; 0 or 1
// Compares Jan 1 minus Jan 1 UTC to Jul 1 minus Jul 1 UTC.
// If they are not equal, then DST is observed.
var a = new Date(f.Y(), 0);
// Jan 1
var c = Date.UTC(f.Y(), 0);
// Jan 1 UTC
var b = new Date(f.Y(), 6);
// Jul 1
// Jul 1 UTC
var d = Date.UTC(f.Y(), 6);
return ((a - c) !== (b - d)) ? 1 : 0;
},
O: function () {
// Difference to GMT in hour format; e.g. +0200
var tzo = jsdate.getTimezoneOffset();
var a = Math.abs(tzo);
return (tzo > 0 ? '-' : '+') + _pad(Math.floor(a / 60) * 100 + a % 60, 4);
},
P: function () {
// Difference to GMT w/colon; e.g. +02:00
var O = f.O();
return (O.substr(0, 3) + ':' + O.substr(3, 2));
},
T: function () {
// Timezone abbreviation; e.g. EST, MDT, ...
// The following works, but requires inclusion of the very
// large timezone_abbreviations_list() function.
/* var abbr, i, os, _default;
if (!tal.length) {
tal = that.timezone_abbreviations_list();
}
if (that.php_js && that.php_js.default_timezone) {
_default = that.php_js.default_timezone;
for (abbr in tal) {
for (i = 0; i < tal[abbr].length; i++) {
if (tal[abbr][i].timezone_id === _default) {
return abbr.toUpperCase();
}
}
}
}
for (abbr in tal) {
for (i = 0; i < tal[abbr].length; i++) {
os = -jsdate.getTimezoneOffset() * 60;
if (tal[abbr][i].offset === os) {
return abbr.toUpperCase();
}
}
}
*/
return 'UTC';
},
Z: function () {
// Timezone offset in seconds (-43200...50400)
return -jsdate.getTimezoneOffset() * 60;
},
// Full Date/Time
c: function () {
// ISO-8601 date.
return 'Y-m-d\\TH:i:sP'.replace(formatChr, formatChrCb);
},
r: function () {
// RFC 2822
return 'D, d M Y H:i:s O'.replace(formatChr, formatChrCb);
},
U: function () {
// Seconds since UNIX epoch
return jsdate / 1000 | 0;
}
};
this.date = function (format, timestamp) {
that = this;
jsdate = (timestamp === undefined ? new Date() : // Not provided
(timestamp instanceof Date) ? new Date(timestamp) : // JS Date()
new Date(timestamp * 1000) // UNIX timestamp (auto-convert to int)
);
return format.replace(formatChr, formatChrCb);
};
return this.date(format, timestamp);
}