Home > Developer > JavaScript

Js obtains the time code of occurrence and termination in the current time zone.

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Js obtains the time code of occurrence and termination in the current time zone.

This article mainly introduces the time code for js to obtain the occurrence and termination of the token in the current time zone. For more information, see

The Code is as follows:

<! DOCTYPE html>

<Html>

<Head>

<Title> DST Calculator </title>

<Script type = "text/javascript">

 

Function DisplayDstSwitchDates ()

{

Var year = new Date (). getYear ();

If (year <1, 1000)

Year + = 1900;

 

Var firstSwitch = 0;

Var secondSwitch = 0;

Var lastOffset = 99;

 

// Loop through every month of the current year

For (I = 0; I <12; I ++)

{

// Fetch the timezone value for the month

Var newDate = new Date (Date. UTC (year, I, 0, 0, 0, 0, 0 ));

Var tz =-1 * newDate. getTimezoneOffset ()/60;

 

// Capture when a timzezone change occurs

If (tz> lastOffset)

FirstSwitch = I-1;

Else if (tz <lastOffset)

SecondSwitch = I-1;

 

LastOffset = tz;

}

 

// Go figure out date/time occurences a minute before

// A DST adjustment occurs

Var secondDstDate = FindDstSwitchDate (year, secondSwitch );

Var firstDstDate = FindDstSwitchDate (year, firstSwitch );

 

If (firstDstDate = null & secondDstDate = null)

Return 'daylight Savings is not observed in your timezone .';

Else

Return 'last minute before DST change occurs in '+

Year + ':' + firstDstDate + 'and' + secondDstDate;

}

 

Function FindDstSwitchDate (year, month)

{

// Set the starting date

Var baseDate = new Date (Date. UTC (year, month, 0, 0, 0, 0, 0 ));

Var changeDay = 0;

Var changeMinute =-1;

Var baseOffset =-1 * baseDate. getTimezoneOffset ()/60;

Var dstDate;

 

// Loop to find the exact day a timezone adjust occurs

For (day = 0; day <50; day ++)

{

Var tmpDate = new Date (Date. UTC (year, month, day, 0, 0, 0, 0 ));

Var tmpOffset =-1 * tmpDate. getTimezoneOffset ()/60;

 

// Check if the timezone changed from one day to the next

If (tmpOffset! = BaseOffset)

{

Var minutes = 0;

ChangeDay = day;

 

// Back-up one day and grap the offset

TmpDate = new Date (Date. UTC (year, month, day-1, 0, 0, 0, 0 ));

TmpOffset =-1 * tmpDate. getTimezoneOffset ()/60;

 

// Count the minutes until a timezone chnage occurs

While (changeMinute =-1)

{

TmpDate = new Date (Date. UTC (year, month, day-1, 0, minutes, 0, 0 ));

TmpOffset =-1 * tmpDate. getTimezoneOffset ()/60;

 

// Determine the exact minute a timezone change

// Occurs

If (tmpOffset! = BaseOffset)

{

// Back-up a minute to get the date/time just

// Before a timezone change occurs

TmpOffset = new Date (Date. UTC (year, month,

Day-1, 0, minutes-1, 0, 0 ));

ChangeMinute = minutes;

Break;

}

Else

Minutes ++;

}

 

// Add a month (for display) since JavaScript counts

// Months from 0 to 11

DstDate = tmpOffset. getMonth () + 1;

 

// Pad the month as needed

If (dstDate <10) dstDate = "0" + dstDate;

 

// Add the day and year

DstDate + = '/' + tmpOffset. getDate () + '/' + year + '';

 

// Capture the time stamp

TmpDate = new Date (Date. UTC (year, month,

Day-1, 0, minutes-1, 0, 0 ));

DstDate + = tmpDate. toTimeString (). split ('') [0];

Return dstDate;

}

}

}

 

</Script>

</Head>

<Body>

<Script type = "text/javascript">

Document. write ("Current date/time:" + new Date () + "<br/> ");

Document. write (DisplayDstSwitchDates ());

</Script>

</Body>

</Html>

 

 

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
current time in pacific zone current time zone in london current time in cst zone current time zone in chicago current time zone in toronto current time zone in california current time zone in ny
Related Article
Ajax and 302 response code Testing

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More