See how to figure out whether or not a given TimeZone supports the Daylight Saving feature and if it is in use. Java supports this with the help of observesDaylightTime() method.
import java.util.TimeZone; public class DayLightDetails { public static void main(String[] args) { DayLightDetails dayLightDetails = new DayLightDetails(); dayLightDetails.proceed(); } public void proceed() { //DayLight savings supported TimeZone - US/Mountain //Timezone object being initialized with US/Mountain System.out.println("TimeZone: US/Mountain"); TimeZone timeZone = TimeZone.getTimeZone("US/Mountain"); System.out.println("Initialized timeZone: " + timeZone); //Checking if the day light is being observed System.out.println("timeZone.observesDaylightTime(): " + timeZone.observesDaylightTime()); //DayLight savings un-supported TimeZone - Asia/Bangkok System.out.println(""); System.out.println("TimeZone: Asia/Bangkok"); timeZone = TimeZone.getTimeZone("Asia/Bangkok"); System.out.println("Initialized timeZone: " + timeZone); //Checking if the day light is being observed System.out.println("timeZone.observesDaylightTime(): " + timeZone.observesDaylightTime()); } } /*
Expected output:
[root@mypc]# java DayLightDetailsTimeZone: US/MountainInitialized timeZone: sun.util.calendar.ZoneInfo[id="US/Mountain",offset=-25200000,dstSavings=3600000,useDaylight=true,transitions=157,lastRule=java.util.SimpleTimeZone[id=US/Mountain,offset=-25200000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=3,startMonth=2,startDay=8,startDayOfWeek=1,startTime=7200000,startTimeMode=0,endMode=3,endMonth=10,endDay=1,endDayOfWeek=1,endTime=7200000,endTimeMode=0]]timeZone.observesDaylightTime(): trueTimeZone: Asia/BangkokInitialized timeZone: sun.util.calendar.ZoneInfo[id="Asia/Bangkok",offset=25200000,dstSavings=0,useDaylight=false,transitions=3,lastRule=null]timeZone.observesDaylightTime(): false*/
Charlie has over a decade of experience in website administration and technology management. As the site admin, he oversees all technical aspects of running a high-traffic online platform, ensuring optimal performance, security, and user experience.
