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JavaScript method setUTCMonth() to set the month according to Universal Time (UTC)

黄舟
Release: 2017-11-07 14:19:25
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Definition and Usage

The setUTCMonth() method is used to set the month based on Universal Time (UTC).

Syntax

dateObject.setUTCMonth(month,day)
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ParametersDescription
month

Required. The value of the month field to be set for dateObject, expressed in universal time.

This parameter is an integer between 0 (January) ~ 11 (December).

day Optional. An integer between 1 and 31, used as the day field of dateObject, expressed in universal time.

Return value

Adjusted date expressed in milliseconds.

Tips and Notes:

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

Tip: For more information about Universal Coordinated Time (UTC), please refer to Baidu Encyclopedia.

Example

Example 1

In this example, we will set the month field to 0 (January) through the setUTCMonth() method:

<script type="text/javascript">

var d=new Date()
d.setUTCMonth(0)
document.write(d)

</script>
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Output:

Sat Jan 07 2017 14:17:55 GMT+0800 (中国标准时间)
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Example 2

In this example, we will set the month to 0 (January) and the day field to 20 through setUTCMonth():

<script type="text/javascript">

var d=new Date()
d.setUTCMonth(0,20)
document.write(d)

</script>
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Output:

Fri Jan 20 2017 14:17:55 GMT+0800 (中国标准时间)
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All parameters of the setUTCMonth() function can exceed the normal value range. For example: the parameter month can exceed the conventional value range of 0 ~ 11; the parameter dateValue can exceed the conventional value range of 1 ~ 31; and both can be negative numbers. The Date object is automatically calculated and converted to the corresponding date internally.
Note that the value of parameter month is 1 less than the actual month.

Return value

The setUTCMonth() function has no return value (or in other words, the return value is undefined).

Example & Description

// 当前运行环境的时区为 UTC +8

//定义一个本地时间的Date对象"2013-05-15 00:00:00"
// 对应的UTC时间为"2013-05-14 16:00:00"
var date = new Date(2013, 4, 15, 0, 0, 0);
document.writeln( date.toLocaleString() ); // 2013年5月15日 0:00:00

date.setUTCMonth(0);
document.writeln( date.toLocaleString() ); // 2013年1月15日 0:00:00

// 此时的UTC时间为"2013-01-14 16:00:00"
date.setUTCMonth(-15, 2);
// 设置完毕后,UTC为"2013-(-14)-(02) 16:00:00" 即"2011-10-02 16:00:00"
// 输出本地时间即为"2011-10-03 00:00:00"
document.writeln( date.toLocaleString() ); // 2011年10月3日 0:00:00

date.setUTCMonth(12, 5);
document.writeln( date.toLocaleString() ); // 2012年1月6日 0:00:00
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