LocalDateTime until() Method in Java with Examples

until() method of the LocalDateTime class used to calculate the amount of time between two LocalDateTime objects using TemporalUnit. The start and end points are this and the specified LocalDateTime passed as a parameter. The result will be negative if the end is before the start. The calculation returns a whole number, representing the number of complete units between the two LocalDateTime. This instance is immutable and unaffected by this method call.

Syntax:

public long until(Temporal endExclusive, TemporalUnit unit)

Parameters: This method accepts two parameters endExclusive which is the end date, exclusive, which is converted to a LocalDateTime and unit which is the unit to measure the amount.

Return value: This method returns the amount of time between this LocalDateTime and the end LocalDateTime.

Exception:This method throws following Exceptions:

  • DateTimeException – if the amount cannot be calculated, or the ending temporal cannot be converted to a LocalDateTime.
  • UnsupportedTemporalTypeException – if the unit is not supported.
  • ArithmeticException – if numeric overflow occurs.

Below programs illustrate the until() method:
Program 1:

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// Java program to demonstrate
// LocalDateTime.until() method
  
import java.time.*;
import java.time.temporal.*;
  
public class GFG {
    public static void main(String[] args)
    {
        // create LocalDateTime objects
        LocalDateTime l1
            = LocalDateTime
                  .parse("2018-12-06T19:21:12");
  
        LocalDateTime l2
            = LocalDateTime
                  .parse("2018-10-25T23:12:31.123");
  
        // apply until method of LocalDateTime class
        long result
            = l2.until(l1,
                       ChronoUnit.MINUTES);
  
        // print results
        System.out.println("Result in MINUTES: "
                           + result);
    }
}

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Output:

Result in MINUTES: 60248

Program 2:

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// Java program to demonstrate
// LocalDateTime.until() method
  
import java.time.*;
import java.time.temporal.*;
  
public class GFG {
    public static void main(String[] args)
    {
        // create LocalDateTime objects
        LocalDateTime l1
            = LocalDateTime
                  .parse("2018-12-06T19:21:12");
  
        LocalDateTime l2
            = LocalDateTime
                  .parse("2018-10-25T23:12:31.123");
  
        // applynedDateTime.parseLocalDateTime class
        long result
            = l2.until(l1,
                       ChronoUnit.MONTHS);
  
        // print results
        System.out.println("Result in MONTHS: "
                           + result);
    }
}

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Output:

Result in MONTHS: 1

References: https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#until(java.time.temporal.Temporal, java.time.temporal.TemporalUnit)



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