The JavaScript method getTime() returns the number of milliseconds since January 1, 1970.-JS Tutorial-php.cn

The JavaScript method getTime() returns the number of milliseconds since January 1, 1970.

黄舟

Release： 2017-11-06 13:08:12

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Definition and Usage

getTime() method returns the number of milliseconds since January 1, 1970.

Syntax

dateObject.getTime()

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Return Value

dateObject The number of milliseconds between the specified date and time since midnight on January 1, 1970 (GMT time).

Tips and Comments:

Comments: This method is always used in conjunction with a Date object.

Example

Example 1

In this example, we will get the number of milliseconds from 1970/01/01 to the present and output it:

<script type="text/javascript">

var d = new Date()
document.write(d.getTime() + " milliseconds since 1970/01/01")

</script>

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Output:

1509944766448 milliseconds since 1970/01/01

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Example 2

In the following example, we will calculate how many years have passed since 1970/01/01:

<script type="text/javascript">

var minutes = 1000*60
var hours = minutes*60
var days = hours*24
var years = days*365
var d = new Date()
var t = d.getTime()
var y = t/years
document.write("It&#39;s been: " + y + " years since 1970/01/01!")

</script>

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Output:

It&#39;s been: 47.88003445104008 years since 1970/01/01!

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Example & Description

// 定义一个当前时间的Date对象(2014-08-07)
var date = new Date();
document.writeln( date.getTime() ); // 1407404680731

// 定义一个"1970-01-01 08:00:00 000"的Date对象
// 由于当前环境为北京GMT+8时区，所以与GMT有8个小时的差值
var date2 = new Date(1970, 0, 1, 8);
document.writeln( date2.getTime() ); // 0

// 定义一个"1965-8-18"的Date对象
var date3 = new Date(1965, 7, 18);
document.writeln( date3.getTime() ); // -138009600000

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Example:

<html>
<head>
<title>JavaScript getTime Method</title>
</head>
<body>
<script type="text/javascript">
  var dt = new Date( "December 25, 1995 23:15:20" );
  document.write("getTime() : " + dt.getTime() ); 
</script>
</body>
</html>

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This will produce the following results:

getTime() : 819913520000

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