The setStartRule(int startofMonth, int startofDay, int startofTime) method of SimpleTimeZone class in Java is used to set a particular start rule of the day-light saving time to a fixed date within a given month.
Syntax:
public void setStartRule(int startofMonth,
int startofDay,
int startofTime)
Parameters: The method takes three parameters:
- startofMonth: This is of Integer type and refers to the Starting month of the daylight saving time.
- startofDay: This is of Integer type and refers to the Starting day of the daylight saving time.
- startofTime: This is of Integer type and refers to the Starting time of the daylight saving time.
Return Value: The method does not return any value.
Below programs illustrate the use of setStartRule() Method in Java:
Example 1:
// Java code to demonstrate// setStartRule() method  import java.util.*;  public class SimpleTimeZone_Demo {    public static void main(String[] args)    {          // Creating SimpleTimeZone object        SimpleTimeZone simtimeobj            = new SimpleTimeZone(100, "GMT");          // Displaying the Initial value        System.out.println(            "Initial value: " + simtimeobj);          // Setting an StartRule        simtimeobj.setStartRule(Calendar.APRIL,                                28, 3600000);          // Displaying the New value        System.out.println(            "New value: " + simtimeobj);    }} |
Output:
Initial value: java.util.SimpleTimeZone[id=GMT, offset=100, dstSavings=3600000, useDaylight=false, startYear=0, startMode=0, startMonth=0, startDay=0, startDayOfWeek=0, startTime=0, startTimeMode=0, endMode=0, endMonth=0, endDay=0, endDayOfWeek=0, endTime=0, endTimeMode=0] New value: java.util.SimpleTimeZone[id=GMT, offset=100, dstSavings=3600000, useDaylight=false, startYear=0, startMode=1, startMonth=3, startDay=28, startDayOfWeek=0, startTime=3600000, startTimeMode=0, endMode=0, endMonth=0, endDay=0, endDayOfWeek=0, endTime=0, endTimeMode=0]
Example 2:
// Java code to demonstrate// setStartRule() method  import java.util.*;  public class SimpleTimeZone_Demo {    public static void main(String[] args)    {          // Creating SimpleTimeZone object        SimpleTimeZone simtimeobj            = new SimpleTimeZone(120, "GMT");          // Displaying the Initial value        System.out.println(            "Initial value: " + simtimeobj);          // Setting an StartRule        simtimeobj.setStartRule(Calendar.JANUARY,                                15, 3600000);          // Displaying the New value        System.out.println(            "New value: " + simtimeobj);    }} |
Output:
Initial value: java.util.SimpleTimeZone[id=GMT, offset=120, dstSavings=3600000, useDaylight=false, startYear=0, startMode=0, startMonth=0, startDay=0, startDayOfWeek=0, startTime=0, startTimeMode=0, endMode=0, endMonth=0, endDay=0, endDayOfWeek=0, endTime=0, endTimeMode=0] New value: java.util.SimpleTimeZone[id=GMT, offset=120, dstSavings=3600000, useDaylight=false, startYear=0, startMode=1, startMonth=0, startDay=15, startDayOfWeek=0, startTime=3600000, startTimeMode=0, endMode=0, endMonth=0, endDay=0, endDayOfWeek=0, endTime=0, endTimeMode=0]
Reference: https://docs.oracle.com/javase/10/docs/api/java/util/SimpleTimeZone.html#setStartRule(int,int,int)
