OffsetDateTime format() method in Java with examples

The format() method of OffsetDateTime class in Java formats this date-time using the specified formatter.

Syntax :

public String format(DateTimeFormatter formatter)

Parameter : This method accepts a single parameter formatter which specfies the formatter to use, not null.

Return Value: It returns the formatted date string, not null.

Exceptions: The function throws a DateTimeException that is when an error occurs during printing.

Below programs illustrate the format() method:

Program 1 :

// Java program to demonstrate the format() method 
import java.time.OffsetDateTime; 
import java.time.format.DateTimeFormatter; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Parses the date1 
        OffsetDateTime date1 = OffsetDateTime.parse("2018-12-12T13:30:30+05:00"); 
  
        // Prints the date 
        System.out.println("Date1: " + date1); 
  
        DateTimeFormatter formatter = DateTimeFormatter.ISO_TIME; 
        System.out.println(formatter.format(date1)); 
    } 
} 

Output:

Date1: 2018-12-12T13:30:30+05:00
13:30:30+05:00

Program 2 :

// Java program to demonstrate the format() method 
// Exceptions 
  
import java.time.OffsetDateTime; 
import java.time.format.DateTimeFormatter; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        try { 
            // Parses the date1 
            OffsetDateTime date1 = OffsetDateTime.parse("2018-13-12T13:30:30+05:00"); 
  
            // Prints the date 
            System.out.println("Date1: " + date1); 
  
            DateTimeFormatter formatter = DateTimeFormatter.ISO_TIME; 
            System.out.println(formatter.format(date1)); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
} 

Output:

java.time.format.DateTimeParseException: Text '2018-13-12T13:30:30+05:00' could not be parsed: Invalid value for MonthOfYear (valid values 1 - 12): 13

Reference: https://docs.oracle.com/javase/8/docs/api/java/time/OffsetDateTime.html#format-java.time.format.DateTimeFormatter-

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