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Showing content from https://www.geeksforgeeks.org/java/zoneddatetime-truncatedto-method-in-java-with-examples/ below:

ZonedDateTime truncatedTo() method in Java with Examples

Last Updated : 17 Dec, 2018

The

truncatedTo()

method of a

ZonedDateTime

class is used to return the value of this ZonedDateTime in the specified unit. This method takes a parameter Unit, which is the Unit in which this ZonedDateTime is to be truncated to. It returns a truncated immutable ZonedDateTime with the value in the specified unit.

Syntax:

public ZonedDateTime truncatedTo(TemporalUnit unit)

Parameters:

This method accepts one single parameter

unit

which is the unit in which this ZonedDateTime is to be truncated to. It should not be null.

Return value:

This method returns a

immutable truncated ZonedDateTime

with the value in the specified unit.

Exception:

This method throws following Exceptions:

DateTimeException: if unable to truncate.
UnsupportedTemporalTypeException: if the unit is not supported.

Below programs illustrate the truncatedTo() method:

Program 1: Java


 // Java program to demonstrate
// ZonedDateTime.truncatedTo() method

import java.time.*;
import java.time.temporal.ChronoUnit;

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

        // create a ZonedDateTime object
        ZonedDateTime zonedDT
            = ZonedDateTime
                  .parse(
                      "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");

        // print ZonedDateTime
        System.out.println("ZonedDateTime before"
                           + " truncate: "
                           + zonedDT);

        // truncate to ChronoUnit.HOURS
        // means unit smaller than Hour
        // will be Zero
        ZonedDateTime returnvalue
            = zonedDT.truncatedTo(ChronoUnit.HOURS);

        // print result
        System.out.println("ZonedDateTime after "
                           + " truncate: "
                           + returnvalue);
    }
}

Output:

ZonedDateTime before truncate: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
ZonedDateTime after  truncate: 2018-12-06T19:00+05:30[Asia/Calcutta]

Program 2: Java


 // Java program to demonstrate
// ZonedDateTime.truncatedTo() method

import java.time.*;
import java.time.temporal.ChronoUnit;

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

        // create a ZonedDateTime object
        ZonedDateTime zonedDT
            = ZonedDateTime
                  .parse(
                      "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");

        // print ZonedDateTime
        System.out.println("ZonedDateTime before"
                           + " truncate: "
                           + zonedDT);

        // truncate to ChronoUnit.DAYS
        // means unit smaller than DAY
        // will be Zero
        ZonedDateTime returnvalue
            = zonedDT.truncatedTo(ChronoUnit.DAYS);

        // print result
        System.out.println("ZonedDateTime after "
                           + " truncate: "
                           + returnvalue);
    }
}

Output:

ZonedDateTime before truncate: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
ZonedDateTime after  truncate: 2018-12-06T00:00+05:30[Asia/Calcutta]

Reference: https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html#withZoneSameInstant(java.time.ZoneId)

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