SimpleTimeZone setStartRule(int, int, int) in Java

setStartRule(int, int, int): This method is available in java.util.SimpleTimeZone class of Java.

Syntax:

void java.util.SimpleTimeZone.setStartRule(int startMonth, int startDay, int startTime)

This method takes three arguments. This method sets the daylight saving time start rule to a fixed date within a month.

Parameters: Three parameters are required for this method.

startMonth: The daylight saving time starting month.

startDay: The day of the month on which the daylight saving time starts.

startTime: The daylight saving time starting time in local wall clock time.

Returns: NA

Throws:

IllegalArgumentException - if the startMonth,startDayOfMonth, or startTime parameters are out of range.

Approach 1: When no exception

Java

import java.util.SimpleTimeZone;

public class SimpleTimeZonesetStartRule {
    public static void main(String[] args) {

        SimpleTimeZone simpleTimeZone = 
                    new SimpleTimeZone(100, "India");

        int startMonth = 1, startDay = 1, startTime = 0;
        simpleTimeZone.setStartRule(startMonth, 
                           startDay, startTime);
        System.out.println(simpleTimeZone);
    }
}

Output:

java.util.SimpleTimeZone[id=India,offset=100,dstSavings=3600000,useDaylight=false,startYear=0,startMode=1,startMonth=1,startDay=1,startDayOfWeek=0,startTime=0,startTimeMode=0,endMode=0,endMonth=0,endDay=0,endDayOfWeek=0,endTime=0,endTimeMode=0]

Approach 2: IllegalArgumentException 

Java

import java.util.SimpleTimeZone;

public class SimpleTimeZonesetStartRule {
    public static void main(String[] args) {

        SimpleTimeZone simpleTimeZone = 
                      new SimpleTimeZone(100, "India");

        int startMonth = 21, startDay = 1, startTime = 0;
        simpleTimeZone.setStartRule(startMonth, 
                             startDay, startTime);
        System.out.println(simpleTimeZone);
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: Illegal start month 21
	at java.base/java.util.SimpleTimeZone.decodeStartRule(SimpleTimeZone.java:1384)
	at java.base/java.util.SimpleTimeZone.setStartRule(SimpleTimeZone.java:393)
	at java.base/java.util.SimpleTimeZone.setStartRule(SimpleTimeZone.java:414)