The getLong() method of OffsetDateTime class in Java gets the value of the specified field from this date-time as an long.
Syntax :
public long getLong(TemporalField field)
Parameter: This method accepts a single parameter field which specifies the field to get, not null.
Return Value: It returns the value for the field.
Exceptions: The function throws three exceptions which are described below:
- DateTimeException: it is thrown if a value for the field cannot be obtained or the value is outside the range of valid values for the field.
- UnsupportedTemporalTypeException: it is thrown if the field is not supported or the range of values exceeds an long.
- ArithmeticException: it is thrown if numeric overflow occurs
Below programs illustrate the getLong() method:
Program 1 :
// Java program to demonstrate the getLong() methodimport java.time.OffsetDateTime;import java.time.temporal.ChronoField;  public class GFG {    public static void main(String[] args)    {          // parses a date        OffsetDateTime date = OffsetDateTime.parse("2018-12-03T12:30:30+01:00");          // Prints the value of the specified        // field from this date-time as an long.        System.out.println(date.getLong(ChronoField.CLOCK_HOUR_OF_DAY));    }} |
Output:
12
Program 2 :
// Java program to demonstrate the getDayOfYear() method// exceptions  import java.time.OffsetDateTime;import java.time.temporal.ChronoField;  public class GFG {    public static void main(String[] args)    {        try {            // parses a date            OffsetDateTime date = OffsetDateTime.parse("2018-24-03T12:30:30+01:00");              // Prints the value of the specified            // field from this date-time as an long.            System.out.println(date.getLong(ChronoField.CLOCK_HOUR_OF_DAY));        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
java.time.format.DateTimeParseException: Text '2018-24-03T12:30:30+01:00' could not be parsed: Invalid value for MonthOfYear (valid values 1 - 12): 24
Reference: https://docs.oracle.com/javase/8/docs/api/java/time/temporal/TemporalField.html
