javascript 时间戳与日期格式之间的互转

1. 将时间戳转换成日期格式
// 简单的一句代码
var date = new Date(时间戳); //获取一个时间对象 注意:如果是uinx时间戳记得乘于1000。比如php函数time()获得的时间戳就要乘于1000

/**
1. 下面是获取时间日期的方法,需要什么样的格式自己拼接起来就好了
2. 更多好用的方法可以在这查到 -> http://www.w3school.com.cn/jsref/jsref_obj_date.asp
*/
date.getFullYear(); // 获取完整的年份(4位,1970)
date.getMonth(); // 获取月份(0-11,0代表1月,用的时候记得加上1)
date.getDate(); // 获取日(1-31)
date.getTime(); // 获取时间(从1970.1.1开始的毫秒数)
date.getHours(); // 获取小时数(0-23)
date.getMinutes(); // 获取分钟数(0-59)
date.getSeconds(); // 获取秒数(0-59)

例子

var add0 = function(m){return m<10?’0’+m:m };

var gettime = function(chuo){
var time = new Date(parseInt(chuo));
// var time = new Date(1000 * parseInt(chuo)); //如果是uinx时间戳记得乘于1000。比如php函数time()获得的时间戳就要乘于1000
var y = time.getFullYear();
var m = time.getMonth()+1;
var d = time.getDate();
var h = time.getHours();
var mm = time.getMinutes();
var s = time.getSeconds();

return y + ‘-‘ + add0(m) + ‘-‘ + add0(d) + ‘ ‘ + add0(h) + ‘:’ + add0(mm) + ‘:’ + add0(s);
};

封装的时间格式器

/**
* 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)}
};

return format.replace(/[\]?([a-zA-Z])/g, 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;
});
}

调用方法 能够很方便的将时间戳转换成日期的格式,如:

date(‘Y-m-d’,’1350052653′);//很方便的将时间戳转换成了2012-10-11
date(‘Y-m-d H:i:s’,’1350052653′);//得到的结果是2012-10-12 22:37:33

2. 将日期格式转换成时间戳
// 也很简单
var strtime = ‘2014-04-23 18:55:49:123’;
var date = new Date(strtime); //传入一个时间格式,如果不传入就是获取现在的时间了,这样做不兼容火狐。
// 可以这样做
var arr = strtime.replace(/ |:/g, ‘-‘).split(‘-‘);
date = new Date(Date.UTC(arr[1], arr[2], arr[3], arr[4], arr[5]));

// 有三种方式获取,在后面会讲到三种方式的区别
time1 = date.getTime();
time2 = date.valueOf();
time3 = Date.parse(date);

/*
三种获取的区别:
第一、第二种:会精确到毫秒
第三种:只能精确到秒,毫秒将用0来代替
比如上面代码输出的结果(一眼就能看出区别):
1398250549123
1398250549123
1398250549000
*/
3. 注意
获取到的时间戳除于1000就可以获得unix的时间戳了,在传值给PHP时用得到

thedarkside

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