Instant minus() method in Java with Examples

In Instant class, there are two types of minus() method depending upon the parameters passed to it.

minus(long amountTosubtract, TemporalUnit unit)

minus() method of a Instant class used to returns a copy of this instant with the specified amount of unit subtracted.If it is not possible to subtract the amount, because the unit is not supported or for some other reason, an exception is thrown.

Syntax:

public Instant minus(long amountToSubtract,
                     TemporalUnit unit)

Parameters: This method accepts two parameters:

  • amountToSubtract which is the amount of the unit to subtract to the result, may be negative and
  • unit which is the unit of the amount to subtract, not null.

Return value: This method returns Instant based on this instant with the specified amount subtracted.

Exception: This method throws following Exceptions:

  • DateTimeException – if the subtraction cannot be made
  • UnsupportedTemporalTypeException – if the unit is not supported
  • ArithmeticException – if numeric overflow occurs

Below programs illustrate the minus() method:

Program 1:

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// Java program to demonstrate
// Instant.minus() method
  
import java.time.*;
import java.time.temporal.ChronoUnit;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an Instant object
        Instant instant
            = Instant.parse("2018-12-30T19:34:50.63Z");
  
        // subtract 20 DAYS to Instant
        Instant value
            = instant.minus(20, ChronoUnit.DAYS);
  
        // print result
        System.out.println("Instant after subtracting DAYS: "
                           + value);
    }
}

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Output:

Instant after subtracting DAYS: 2018-12-10T19:34:50.630Z

minus(TemporalAmount amountTosubtract)

minus() method of a Instant class used to returns a copy of this instant with the specified amount subtracted to date-time.The amount is typically Period or Duration but may be any other type implementing the TemporalAmount interface.

Syntax:

public Instant minus(TemporalAmount amountTosubtract)

Parameters: This method accepts one single parameter amountTosubtract which is the amount to subtract, It should not be null.

Return value: This method returns Instant based on this date-time with the subtractition made, not null.

Exception: This method throws following Exceptions:

  • DateTimeException – if the subtraction cannot be made
  • ArithmeticException – if numeric overflow occurs

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

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link
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code

// Java program to demonstrate
// Instant.minus() method
  
import java.time.*;
public class GFG {
    public static void main(String[] args)
    {
  
        // create an Instant object
        Instant inst
            = Instant.parse("2018-12-30T19:34:50.63Z");
  
        // subtract 10 Days to Instant
        Instant value
            = inst.minus(Period.ofDays(10));
  
        // print result
        System.out.println("Instant after subtracting Days: "
                           + value);
    }
}

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Output:

Instant after subtracting Days: 2018-12-20T19:34:50.630Z

References:
https://docs.oracle.com/javase/10/docs/api/java/time/Instant.html#minus(java.time.temporal.TemporalAmount)
https://docs.oracle.com/javase/10/docs/api/java/time/Instant.html#minus(long, java.time.temporal.TemporalUnit)



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