How to convert js timestamp to date format-JS Tutorial-php.cn

How to convert js timestamp to date format

PHPz

Release： 2018-10-13 16:39:21

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What is Unix timestamp: Unix timestamp, also known as Unix time or POSIX time, is a time representation method, defined as the time from Greenwich The total number of seconds from 00:00:00 on January 1, 1970 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.

1.js Convert 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();

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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;
getTime()返回数值的单位是毫秒。

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2.js to get the time Convert to normal date format

1. Date toLocaleString method

function getLocalTime(nS) {  
 return new Date(parseInt(nS) * 1000).toLocaleString().replace(/:\d{1,2}$/,&#39; &#39;);  
}

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parseInt() function parses a string and returns an integer.

The unit of time operation in js is milliseconds.

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

replace() 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 ending with one or two digits, which is seconds; replace it with empty

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

2.Date attribute method

function add0(m){return m<10?&#39;0&#39;+m:m }
function format(shijianchuo)
{
//shijianchuo是整数，否则要parseInt转换
var time = new Date(shijianchuo);
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+&#39;-&#39;+add0(m)+&#39;-&#39;+add0(d)+&#39; &#39;+add0(h)+&#39;:&#39;+add0(mm)+&#39;:&#39;+add0(s);
}

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3. The encapsulated time formatter

/** 
 * 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()] : &#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 = 4 && a >= (6 - nd)){ 
     nd2 = new Date(jsdate.getFullYear() - 1 + "/12/31"); 
     return date("W", Math.round(nd2.getTime()/1000)); 
    } else{ 
     return (1 + (nd > 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; 
 }); 
}

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

date(&#39;Y-m-d&#39;,&#39;1350052653&#39;);//很方便的将时间戳转换成了2012-10-11 
date(&#39;Y-m-d H:i:s&#39;,&#39;1350052653&#39;);//得到的结果是2012-10-12 22:37:33

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The above is the method of converting js timestamp to date format. I hope it will be helpful to everyone's learning.

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