Java Convert Calendar to Timestamp

Tags: Java Calendar Java Timestamp

In this Java core tutorial we learn how to convert a java.util.Calendar object to a java.sql.Timestamp object in Java programming language.

How to convert Calendar to Timestamp in Java

In Java program, with a given Calendar object we can follow these steps to convert it to Timestamp object.

  • Using the Date.getTimeInMillis() method to return epoch milliseconds value which is the number of milliseconds since January 1, 1970, 00:00:00 GMT.
  • Using the Timestamp(long time) constructor to instantiate a new Timestamp object from epoch milliseconds value.

In the following example Java code we show how to convert Calendar object to Timestamp object using the steps above.

ConvertCalendarToTimestampExample1.java 

import java.sql.Timestamp;
import java.util.Calendar;

public class ConvertCalendarToTimestampExample1 {
    public static void main(String... args) {
        Calendar calendar = Calendar.getInstance();

        // Convert Calendar object to Timestamp object
        Timestamp timestamp = new Timestamp(calendar.getTimeInMillis());

        System.out.println("Calendar year: " + calendar.get(Calendar.YEAR));
        System.out.println("Calendar month (JANUARY is 0): " + calendar.get(Calendar.MONTH));
        System.out.println("Calendar day of month: " + calendar.get(Calendar.DAY_OF_MONTH));
        System.out.println("Calendar hour: " + calendar.get(Calendar.HOUR_OF_DAY));
        System.out.println("Calendar minute: " + calendar.get(Calendar.MINUTE));
        System.out.println("Calendar second: " + calendar.get(Calendar.SECOND));
        System.out.println("Calendar millisecond: " + calendar.get(Calendar.MILLISECOND));
        System.out.println("Timestamp: " + timestamp);
    }
}
The output as below. 
Calendar year: 2022
Calendar month (JANUARY is 0): 4
Calendar day of month: 18
Calendar hour: 23
Calendar minute: 11
Calendar second: 41
Calendar millisecond: 183
Timestamp: 2022-05-18 23:11:41.183

Happy Coding 😊

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