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

Source: Internet
Author: User
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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:
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