This article mainly introduces JS to obtain the current time zone daylight saving period and termination of the code, the need for friends can refer to the following
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 < 1000) year = 1900; var firstswitch = 0; var secondswitch = 0;&nbs P var LastOffset = 99; /Loop through every month of the current year for (i = 0; i <; i++) { //Fetch The timezone value for the month var newdate = new Date (DATE.UTC (year, I, 0, 0, 0, 0, 0)); VA R TZ =-1 * newdate.gettimezoneoffset ()/60; //Capture when a timzezone change occurs if (TZ > Las Toffset) Firstswitch = i-1; else if (TZ < LastOffset) Secondswitch = i-1; LastOffset = t z; } //Go figure out date/time occurences a minute before //a DST adjustment occurs var s Econddstdate = FINDDSTSWItchdate (Secondswitch); var firstdstdate = finddstswitchdate (year, firstswitch); if ( Firstdstdate = = NULL && seconddstdate = null) Return ' daylight savings are not observed in your timezone. ' else return ' last minute before DST change occurs in ' + year + ': ' + firstdstdate + ' and ' + secondd stdate; } Function finddstswitchdate (year, month) { //Set The starting date var base Date = new Date (DATE.UTC (year, month, 0, 0, 0, 0, 0)); var changeday = 0; var changeminute = -1; var bas Eoffset =-1 * basedate.gettimezoneoffset ()/60; var dstdate; //Loop to find the exact day a timezone Adjust occurs for (day = 0; day < 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 offs et 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) { TmpD ate = new Date (DATE.UTC (year, month, Day-1, 0, minutes, 0, 0)); tmpoffset =-1 * tmpdate.gettimezoneoffset ()/60;&N Bsp //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 (y Ear, 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 < ten) Dstdate = "0" + dstdate; //ADD th E 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>& nbsp <script type= "Text/javascript" > document.write ("Current date/time:" + new Date () + "<br/>"); do Cument.write (Displaydstswitchdates ()); </script> </body> </html> Start building with 50+ products and up to 12 months usage for Elastic Compute Service
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