Java by API/java.util/TimeZone

TimeZone: getAvailableIDs()

   <source lang="java">

import java.util.Arrays; import java.util.TimeZone; public class Main {

   public static void main(String[] args) {
       String[] allTimeZones = TimeZone.getAvailableIDs();
       
       Arrays.sort(allTimeZones);
       for (String timezone : allTimeZones) {
           System.out.println(timezone);
       }
   }

}

 </source>
   
  
 
  

TimeZone: getDefault()

   <source lang="java">

import java.util.Calendar; import java.util.GregorianCalendar; import java.util.TimeZone; public class Main {

 public static void main(String[] argv) throws Exception {
   // Get the current time in Hong Kong
   Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("Hongkong"));
   int hour12 = cal.get(Calendar.HOUR); // 0..11
   int minutes = cal.get(Calendar.MINUTE); // 0..59
   int seconds = cal.get(Calendar.SECOND); // 0..59
   boolean am = cal.get(Calendar.AM_PM) == Calendar.AM;
   // Get the current hour-of-day at GMT
   cal.setTimeZone(TimeZone.getTimeZone("GMT"));
   int hour24 = cal.get(Calendar.HOUR_OF_DAY); // 0..23
   // Get the current local hour-of-day
   cal.setTimeZone(TimeZone.getDefault());
   hour24 = cal.get(Calendar.HOUR_OF_DAY); // 0..23
 }

}

 </source>
   
  
 
  

TimeZone: getDisplayName()

   <source lang="java">

import java.util.Calendar; import java.util.TimeZone; public class Main {

 public static void main(String[] args) {
   Calendar now = Calendar.getInstance();
   TimeZone timeZone = now.getTimeZone();
   System.out.println("Current TimeZone is : " + timeZone.getDisplayName());
 }

}

 </source>
   
  
 
  

TimeZone: getTimeZone(String ID)

   <source lang="java">
    

import java.util.GregorianCalendar; import java.util.Locale; import java.util.TimeZone; public class Main {

 public static void main(String[] a) {
   GregorianCalendar calendar = new GregorianCalendar(TimeZone.getTimeZone("America/Chicago"),
       Locale.US);
   System.out.println(calendar);
 }

}

 </source>