Definition and Usage
定义与用法

The getTimezoneOffset() method returns the difference in minutes between local time and Greenwich Mean Time (GMT).
getTimezoneOffset() 方法可以返回本地时间和GMT相差了多少分钟

Syntax
语法

dateObject.getTimezoneOffset()

Tips and Notes
提示与注意点

Note: The returned value of this method is not a constant, because of the practice of using Daylight Saving Time.
注意：这个方法所返回的值并不是一直不变，因为它的算法是使用了白昼保留时间

Note: This method is always used in conjunction with a Date object.
注意：这个方法得结合Date对象使用

Example
举例

In the following example we get the difference in minutes between local time and Greenwich Mean Time (GMT):
这个举例中我们将得到本地时间与GMT相差的分钟数：

<script type="text/javascript">

var d = new Date()
document.write(d.getTimezoneOffset())

</script>

The output of the code above will be:
输出结果为：

Example 2
举例 2

Now we will convert the example above into GMT +/- hours:
现在我们将上面那个举例转换成为GMT +/- 小时的形式

<script type="text/javascript">

var d = new Date()
var gmtHours = d.getTimezoneOffset()/60
document.write("The local time zone is: GMT " + gmtHours)

</script>

The output of the code above will be:
输出结果为：

Try-It-Yourself Demos
尝试与演示

getTimezoneOffset()
How to use getTimezoneOffset() to get the local time zone according to GMT.
怎样使用getTimezoneOffset()来获得当地GMT时区

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