ZonedDateTime getLong() method in Java with Examples

The getLong() method of ZonedDateTime class in Java is used to get the value of the specified field passed as input from this ZonedDateTime as an long value.This method queries this ZonedDateTime for the value of the field and the returned value will always be within the valid range of values for the field. When the field is not supported and method is unable to return int value then an exception is thrown.

Syntax:

public int getLong(TemporalField field)

Parameters: This method accepts a single parameter field which represents the field to get. This is a mandatory parameter and it should not be null.

Return value: This method returns an int value for the field.

Exception: This method throws following exceptions:

• DateTimeException: if a value for the field cannot be obtained or the value is outside the range of valid values for the field.
• UnsupportedTemporalTypeException : if the field is not supported or the range of values exceeds an int.
• ArithmeticException : if numeric overflow occurs.

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

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

import java.time.*;
import java.time.temporal.ChronoField;

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]");

        // get all enum of chronofield
        // and iterate through all enum values
        for (ChronoField field : ChronoField.values()) {

            try {
                // get long value of field
                long value = zonedDT.getLong(field);
                System.out.println("field : " + field
                                   + " || value : " + value);
            }
            catch (Exception e) {
                System.out.println("e " + field);
            }
        }
    }
}

Output:

field : NanoOfSecond || value : 123000000
field : NanoOfDay || value : 69672123000000
field : MicroOfSecond || value : 123000
field : MicroOfDay || value : 69672123000
field : MilliOfSecond || value : 123
field : MilliOfDay || value : 69672123
field : SecondOfMinute || value : 12
field : SecondOfDay || value : 69672
field : MinuteOfHour || value : 21
field : MinuteOfDay || value : 1161
field : HourOfAmPm || value : 7
field : ClockHourOfAmPm || value : 7
field : HourOfDay || value : 19
field : ClockHourOfDay || value : 19
field : AmPmOfDay || value : 1
field : DayOfWeek || value : 4
field : AlignedDayOfWeekInMonth || value : 6
field : AlignedDayOfWeekInYear || value : 4
field : DayOfMonth || value : 6
field : DayOfYear || value : 340
field : EpochDay || value : 17871
field : AlignedWeekOfMonth || value : 1
field : AlignedWeekOfYear || value : 49
field : MonthOfYear || value : 12
field : ProlepticMonth || value : 24227
field : YearOfEra || value : 2018
field : Year || value : 2018
field : Era || value : 1
field : InstantSeconds || value : 1544104272
field : OffsetSeconds || value : 19800

Program 2:

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

import java.time.*;
import java.time.temporal.ChronoField;

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

        // create a ZonedDateTime object
        ZonedDateTime zonedDT
            = ZonedDateTime.parse("2018-10-25T23:12:31.123+02:00[Europe/Paris]");

        // try to find AMPM_OF_DAY
        // using ChronoField.AMPM_OF_DAY
        // in getLong method
        try {

            long value
                = zonedDT.getLong(
                    ChronoField.AMPM_OF_DAY);

            // print result
            System.out.println("AMPM_OF_DAY value: " + value);
        }
        catch (Exception e) {

            // print exception
            System.out.println("Exception: " + e);
        }
    }
}

Output:

AMPM_OF_DAY value: 1

Reference:
https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html#getLong(java.time.temporal.TemporalField)