How to convert timestamp to time in javascript

In javascript, you can use the toLocaleString method to convert timestamps into time, and the syntax format is "timestamp data.toLocaleString()". The toLocaleString method can convert the Date object into a string according to the local time and return the result.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

js Convert timestamp to date format

What is Unix timestamp (Unix timestamp): Unix timestamp (Unix timestamp), or Unix time (Unix time), POSIX time (POSIX time) is a way of expressing time, defined as the total number of seconds from 00:00:00 on January 1, 1970, Greenwich Mean Time to the present. Unix timestamps are not only used in Unix systems and Unix-like systems, but are also widely used in many other operating systems.

Currently, quite a few operating systems use 32-bit binary numbers to represent time. Unix timestamps for such systems can be used up to January 19, 2038, 03:14:07 GMT (binary: 01111111 11111111 11111111 11111111). One second later, the binary number will change to 10000000 00000000 00000000 00000000, and an overflow error will occur, causing the system to misunderstand the time as 20:45:52 on December 13, 1901. This is likely to cause software failure or even system paralysis. Systems that use 64-bit binary numbers to represent time (which can be used up to 15:30:08 on December 4, 292,277,026,596 Greenwich Time) will basically not encounter this type of overflow problem.

js converts timestamp to ordinary date format

1.Date toLocaleString method

function getLocalTime(nS) {     
   return new Date(parseInt(nS) * 1000).toLocaleString().replace(/:\d{1,2}$/,' ');     
}

parseInt() function can parse a string and return an integer.

The unit of time operation in js is milliseconds.

The toLocaleString() method can convert the Date object into a string according to the local time and return the result.

Thereplace() method is used to replace some characters with other characters in a string, or replace a substring that matches a regular expression.

replace(/:\d{1,2}$/,' ') Verify that the replacement starts with: a string that ends with one or two digits, which is seconds; replace it with nothing

Displayed as follows:

So we can use regular expressions to change the date format we want.

Extended information:

js converts time into timestamp

1.js method to get the current timestamp

var timestamp1 = Date.parse(new Date());

var timestamp2 = (new Date()).valueOf();

var timestamp3 = new Date().getTime();

The first type: the timestamp obtained is to change the millisecond to 000 for display. The second and third types are to obtain the timestamp of the current millisecond.

2.js method to obtain the specified timestamp

var oldTime = (new Date("2015/06/23 08:00:20")).getTime()/1000;

The unit of the value returned by getTime() is milliseconds.

Encapsulated time formatter

/** 
 * 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()] : &#39;th&#39;}, 
        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; 
    }); 
}

The calling method can easily convert the timestamp into date format, such as:

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

[Recommended learning: javascript Advanced Tutorial】

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