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@godcheese
Last active Jul 15, 2017
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JavaScript 时间戳格式化函数
/**
* 和PHP一样的时间戳格式化函数
* @param {string} format 格式
* @param {int} timestamp 要格式化的时间 默认为当前时间
* @return {string} 格式化的时间字符串
*/
function date(format, timestamp) {
var a, jsdate = ((timestamp) ? new Date(timestamp * 1000) : new Date());
var pad = function (n, c) {
if ((n = n + "").length < c) {
return new Array(++c - n.length).join("0") + n;
} else {
return n;
}
};
var txt_weekdays = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
var txt_ordin = {1: "st", 2: "nd", 3: "rd", 21: "st", 22: "nd", 23: "rd", 31: "st"};
var txt_months = ["", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
var f = {
// Day
d: function () {
return pad(f.j(), 2)
},
D: function () {
return f.l().substr(0, 3)
},
j: function () {
return jsdate.getDate()
},
l: function () {
return txt_weekdays[f.w()]
},
N: function () {
return f.w() + 1
},
S: function () {
return txt_ordin[f.j()] ? txt_ordin[f.j()] : 'th'
},
w: function () {
return jsdate.getDay()
},
z: function () {
return (jsdate - new Date(jsdate.getFullYear() + "/1/1")) / 864e5 >> 0
},
// Week
W: function () {
var a = f.z(), b = 364 + f.L() - a;
var nd2, nd = (new Date(jsdate.getFullYear() + "/1/1").getDay() || 7) - 1;
if (b <= 2 && ((jsdate.getDay() || 7) - 1) <= 2 - b) {
return 1;
} else {
if (a <= 2 && nd >= 4 && a >= (6 - nd)) {
nd2 = new Date(jsdate.getFullYear() - 1 + "/12/31");
return date("W", Math.round(nd2.getTime() / 1000));
} else {
return (1 + (nd <= 3 ? ((a + nd) / 7) : (a - (7 - nd)) / 7) >> 0);
}
}
},
// Month
F: function () {
return txt_months[f.n()]
},
m: function () {
return pad(f.n(), 2)
},
M: function () {
return f.F().substr(0, 3)
},
n: function () {
return jsdate.getMonth() + 1
},
t: function () {
var n;
if ((n = jsdate.getMonth() + 1) == 2) {
return 28 + f.L();
} else {
if (n & 1 && n < 8 || !(n & 1) && n > 7) {
return 31;
} else {
return 30;
}
}
},
// Year
L: function () {
var y = f.Y();
return (!(y & 3) && (y % 1e2 || !(y % 4e2))) ? 1 : 0
},
//o not supported yet
Y: function () {
return jsdate.getFullYear()
},
y: function () {
return (jsdate.getFullYear() + "").slice(2)
},
// Time
a: function () {
return jsdate.getHours() > 11 ? "pm" : "am"
},
A: function () {
return f.a().toUpperCase()
},
B: function () {
// peter paul koch:
var off = (jsdate.getTimezoneOffset() + 60) * 60;
var theSeconds = (jsdate.getHours() * 3600) + (jsdate.getMinutes() * 60) + jsdate.getSeconds() + off;
var beat = Math.floor(theSeconds / 86.4);
if (beat > 1000) beat -= 1000;
if (beat < 0) beat += 1000;
if ((String(beat)).length == 1) beat = "00" + beat;
if ((String(beat)).length == 2) beat = "0" + beat;
return beat;
},
g: function () {
return jsdate.getHours() % 12 || 12
},
G: function () {
return jsdate.getHours()
},
h: function () {
return pad(f.g(), 2)
},
H: function () {
return pad(jsdate.getHours(), 2)
},
i: function () {
return pad(jsdate.getMinutes(), 2)
},
s: function () {
return pad(jsdate.getSeconds(), 2)
},
//u not supported yet
// Timezone
//e not supported yet
//I not supported yet
O: function () {
var t = pad(Math.abs(jsdate.getTimezoneOffset() / 60 * 100), 4);
if (jsdate.getTimezoneOffset() > 0) t = "-" + t; else t = "+" + t;
return t;
},
P: function () {
var O = f.O();
return (O.substr(0, 3) + ":" + O.substr(3, 2))
},
//T not supported yet
//Z not supported yet
// Full Date/Time
c: function () {
return f.Y() + "-" + f.m() + "-" + f.d() + "T" + f.h() + ":" + f.i() + ":" + f.s() + f.P()
},
//r not supported yet
U: function () {
return Math.round(jsdate.getTime() / 1000)
}
};
var exp = /[\\]?([a-zA-Z])/g;
return format.replace(exp, function (t, s) {
if (t != s) {
// escaped
ret = s;
} else if (f[s]) {
// a date function exists
ret = f[s]();
} else {
// nothing special
ret = s;
}
return ret;
});
}
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