ZonedDateTime minusHours() method in Java with Examples Last Updated : 10 Dec, 2018 Comments Improve Suggest changes Like Article Like Report minusHours() method of a ZonedDateTime class used to subtract the number of hours from this ZonedDateTime and return a copy of ZonedDateTime after subtraction.This operates on the instant time-line, such that subtracting one hour will always be a duration of one hour earlier. subtracting one hour may cause the local date-time to change by an amount other than one hour. For example, consider a time-zone, such as 'Europe/Paris', where the Autumn DST cutover means that the local times 02:00 to 02:59 occur twice changing from offset +02:00 in summer to +01:00 in winter. Subtracting one hour from 03:30+01:00 will result in 02:30+01:00 (both in winter time) Subtracting one hour from 02:30+01:00 will result in 02:30+02:00 (moving from winter to summer time) Subtracting one hour from 02:30+02:00 will result in 01:30+02:00 (both in summer time) Subtracting three hours from 03:30+01:00 will result in 01:30+02:00 (moving from winter to summer time) This instance is immutable and unaffected by this method call. Syntax: public ZonedDateTime minusHours(long hours) Parameters: This method accepts a single parameter hours which represents the hours to subtract, It can be negative. Return value: This method returns a ZonedDateTime based on this date-time with the hours subtracted. Exception: This method throws DateTimeException if the result exceeds the supported date range. Below programs illustrate the minusHours() method: Program 1: Java // Java program to demonstrate // ZonedDateTime.minusHours() method import java.time.*; public class GFG { public static void main(String[] args) { // create a ZonedDateTime object ZonedDateTime zoneddatetime = ZonedDateTime.parse( "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]"); // print instance System.out.println("ZonedDateTime before" + " subtracting hours: " + zoneddatetime); // subtract 3 hours ZonedDateTime returnvalue = zoneddatetime.minusHours(3); // print result System.out.println("ZonedDateTime after " + " subtracting 3 hours: " + returnvalue); } } Output: ZonedDateTime before subtracting hours: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta] ZonedDateTime after subtracting 3 hours: 2018-12-06T16:21:12.123+05:30[Asia/Calcutta] Program 2: Java // Java program to demonstrate // ZonedDateTime.minusHours() method import java.time.*; public class GFG { public static void main(String[] args) { // create a ZonedDateTime object ZonedDateTime zoneddatetime = ZonedDateTime.parse( "2018-10-25T23:12:31.123+02:00[Europe/Paris]"); // print instance System.out.println("ZonedDateTime before" + " subtracting hours: " + zoneddatetime); // subtract 20 hours ZonedDateTime returnvalue = zoneddatetime.minusHours(20); // print result System.out.println("ZonedDateTime after " + " subtracting 20 hours: " + returnvalue); } } Output: ZonedDateTime before subtracting hours: 2018-10-25T23:12:31.123+02:00[Europe/Paris] ZonedDateTime after subtracting 20 hours: 2018-10-25T03:12:31.123+02:00[Europe/Paris] Reference: https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html#minusHours(long) Comment More infoAdvertise with us Next Article ZonedDateTime minusHours() method in Java with Examples A AmanSingh2210 Follow Improve Article Tags : Java Java-Functions Java-time package Java-ZonedDateTime Practice Tags : Java Similar Reads ZonedDateTime plusHours() method in Java with Examples plusHours() method of a ZonedDateTime class used to add the number of hours in this ZonedDateTime and return a copy of ZonedDateTime after addition.This operates on the instant time-line, such that adding one hour will always be a duration of one hour later. 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