Introduction to javascript time zone function_time and date

js time zone function:

Suppose datename is a created Date object

================ ====
datename.getTimezoneOffset()
--Get the difference between local time and GMT time (Greenwich Mean Time), the return value is in minutes
======== ============

Example: Get GMT time and time in any time zone based on local time

d=new Date(); //Create a Date object
localTime = d.getTime();
localOffset=d.getTimezoneOffset()*60000; //Get the number of milliseconds of local time offset
utc = localTime localOffset; //utc is GMT time
offset =10; //Take Hawaii time as an example, East District 10
hawaii = utc (3600000*offset);
nd = new Date(hawaii);
document.writeln("Hawaii time is " nd.toLocaleString()
");

============================
Date.UTC(year, month, day, hours, minutes, seconds, ms)

--Construct a Date object based on GMT time and return a Date object
============ ===================

Creating a Date object directly will assume that the input is local time, while creating an object using Date.UTC will assume that the input is GMT. Time

============================
datename.toUTCString()
datename.toGMTString( )
--Output GMT time
================================

The two functions are the same .The latter is considered obsolete.

Relative to toLocaleString outputs local time, this function outputs GMT time

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Others
==============================

getUTCDate() function--returns the day of the month (1-31) in the date object expressed in Universal Coordinated Time (UTC)
getUTCDay() function--returns the day of the month expressed in UTC in the date object The day of the week represented (0-6)
getUTCFulYear() function--returns the four-digit year in the date object expressed in Universal Coordinated Time (UTC)
getUTCHours() function--returns the four-digit year in the date object expressed in UTC The number of hours in Universal Coordinated Time (UTC) (0-23)
getUTCMilliseconds() function--returns the number of milliseconds in the date object expressed in Universal Coordinated Time (UTC) (0-999)
getUTCMinutes() Function -- Returns the number of minutes (0-59) expressed in Universal Coordinated Time (UTC) in the date object
getUTCMonth() Function -- Returns the number of months (0-59) expressed in Universal Coordinated Time (UTC) in the date object 11)
getUTCSeconds() function -- returns the number of seconds in the date object expressed in Universal Coordinated Time (UTC) (0-59)


setUTCDate() function -- sets the date object The day of the month expressed in Universal Coordinated Time (UTC), and returns the number of milliseconds (timestamp) between the date object and midnight on January 1, 1970
setUTCFulYear() function -- sets the date object in world standard The year, month and day represented by time (UTC), and returns the number of milliseconds (timestamp) between the date object and midnight on January 1, 1970
setUTCHours() function --- Set the world standard in the date object Hours, minutes, seconds and milliseconds represented by time (UTC), and returns the number of milliseconds (timestamp) between the date object and midnight on January 1, 1970
setUTCMilliseconds() function--Set the world used in the date object The number of milliseconds expressed in standard time (UTC), and returns the number of milliseconds (timestamp) between the date object and midnight on January 1, 1970
setUTCMinutes() function--Set the date object using Universal Standard Time (UTC) ) represents the minutes and seconds, and returns the number of milliseconds (timestamp) between the date object and midnight on January 1, 1970
setUTCMonth() function--Set the date object expressed in Universal Coordinated Time (UTC) Month, day, and returns the number of milliseconds (timestamp) between the date object and midnight on January 1, 1970
setUTCSeconds() function--Sets the seconds and milliseconds in the date object expressed in Universal Coordinated Time (UTC) , and returns the number of milliseconds (timestamp) between the date object and midnight on January 1, 1970

In the time zone in js, we generally talk about the time between Greenwich Time and local time The time difference is measured in minutes, which is no different from PHP and ASP. Let's use the date() function to introduce the related issues of js time zone.

Definition and Usage

The getTimezoneOffset() method returns the time difference between Greenwich Mean Time and local time, in minutes.
Syntax
dateObject.getTimezoneOffset() return value
The time difference between local time and GMT time, in minutes.
In the following example, we will get the time difference in minutes between GMT time and local time:

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