Java: Convert java.util.Date to calendar

Using Calendar#setTime method, we can set the calendar time to given date.

 

Find the below working application.

 

DateToCalendar.java

package com.sample.app;

import java.util.Calendar;
import java.util.Date;

public class DateToCalendar {
    
    public static void main(String[] args) {
        Date date = new Date();
        
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        
        System.out.println("date in millis : " + date.getTime());
        System.out.println("calendar in millis : " + calendar.getTimeInMillis());
    }

}

 

Output

date in millis : 1661061743001
calendar in millis : 1661061743001

 

  

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Java: Get time in milliseconds from Date, Calendar and ZonedDateTime

Get time in milliseconds from Date

Date#getTime() method return the time in milliseconds.

Date date = new Date();
long timeMillis1 = date.getTime();

 

Get time in milliseconds from Calendar

Calendar#getTimeInMillis() method return the time in milliseconds.

Calendar calendar = Calendar.getInstance();
long timeMillis2 = calendar.getTimeInMillis();

Get time in milliseconds from ZonedDateTime

ZonedDateTime zonedDateTime = ZonedDateTime.now();
Instant instant = zonedDateTime.toInstant();
long timeMillis3 = instant.toEpochMilli();

Find the below working application.

 

TimeInMilliseconds.java

package com.sample.app;

import java.time.Instant;
import java.time.ZonedDateTime;
import java.util.Calendar;
import java.util.Date;

public class TimeInMilliseconds {

    public static void main(String[] args) {
        Date date = new Date();
        long timeMillis1 = date.getTime();

        Calendar calendar = Calendar.getInstance();
        long timeMillis2 = calendar.getTimeInMillis();

        ZonedDateTime zonedDateTime = ZonedDateTime.now();
        Instant instant = zonedDateTime.toInstant();
        long timeMillis3 = instant.toEpochMilli();

        System.out.println("timeMillis1 : " + timeMillis1);
        System.out.println("timeMillis2 : " + timeMillis2);
        System.out.println("timeMillis3 : " + timeMillis3);
    }

}

Output

timeMillis1 : 1661059945266
timeMillis2 : 1661059945284
timeMillis3 : 1661059945323

 

 

 

 

 

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Print all the current week dates in Java

Using ‘java.util.Calendar’ class, we can get all the current week dates in Java.

 

CurrentWeekDates.java

package com.sample.app;

import java.util.Calendar;
import java.util.Date;

public class CurrentWeekDates {

	private static void printAllCurrentWeekDates() {
		Calendar calendar = Calendar.getInstance();

		for (int i = Calendar.SUNDAY; i <= Calendar.SATURDAY; i++) {
			calendar.set(Calendar.DAY_OF_WEEK, i);
			System.out.println("Date " + calendar.getTime());
		}

	}

	public static void main(String[] args) {
		System.out.println("today : " + new Date() +"\n\n");
		printAllCurrentWeekDates();
	}

}

Sample Output

today : Mon Jul 11 09:56:33 IST 2022


Date Sun Jul 10 09:56:33 IST 2022
Date Mon Jul 11 09:56:33 IST 2022
Date Tue Jul 12 09:56:33 IST 2022
Date Wed Jul 13 09:56:33 IST 2022
Date Thu Jul 14 09:56:33 IST 2022
Date Fri Jul 15 09:56:33 IST 2022
Date Sat Jul 16 09:56:33 IST 2022

 

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How to get current weeks Tuesday date

Following program return the current weeks Tuesday date.

 

CurrentWeekTuesdayDate.java

package com.sample.app;

import java.util.Calendar;

public class CurrentWeekTuesdayDate {

	public static void main(String[] args) {
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
		
		System.out.println("Date " + calendar.getTime());

	}

}

Output

Date Sat Jul 09 21:11:19 IST 2022

 

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Java: date and time programs

 

      Convert time stamp to Date Format

      Convert yyyy-MM-dd HH:mm:ss.SSS format to date object

      Convert yyyy-MM-dd HH:mm:ss.SSS format date to long value

      Convert long value to yyyy-MM-dd HH:mm:ss.SSS format

      Get year, date, day, time from Calendar

      Java: Get number of weeks between two dates

      Java: Get number of months between two dates

      Java: Get number of days between two dates

      Java: Get number of years between two dates

      Java: Number of hours between two dates

      Java: Get number of minutes between two dates

      Java: get number of seconds between two dates

      How to add days to a date in Java?

      Java: Check whether given date is valid or not

      Java: Increment the date by one day

      Java: Get date and time for given time zone

      Java: Get all supported time zones

      Get milliseconds from LocalDateTime

      Get Date from Unix timestamp

      Get Instant from Unix time stamp

      Get Calendar from Unix time stamp

      Set Default time zone to the application

      How to set time zone for java.util.Date

      Format Instant to String

      Get LocalDate from long epoch time

      Get LocalDateTime from long epoch time

      Compare two dates without time portion

      Java Convert LocalDate to Date

      Java program to display date and time

      Java: Convert the current time to HOURS:MINUTES:SECONDS:MILLISECONDS format

      How to get java.sql.TimeStamp in Java?

      How to set JVM timezone?

      Java: Is LocalDate has time information?

      Java: convert milliseconds to Date object

      Java: Get start time of next month date

      java: Get start time of next week date

      java: Get start time of next day

      Java: Get the start time of next hour

      Java: Get start time of next minute

      Java: Get start time of next second

      Get Date object from year, month and day

      How to get current weeks Tuesday date?

      Print all the current week dates in Java

      Convert the date string yyyy-MM-dd to dd-MM-yyyy in Java?

      Convert date or time from one time zone to other

      Java: Get time in milliseconds from Date, Calendar and ZonedDateTime

      Java: Get milliseconds from given date and time

      Java: Convert java.util.Date to calendar

      Java: Get current date and time using LocalDate, LocalTime, LocalDateTime

      Java: Convert time from 12 hour format to 24 hour format

      Java: Convert time from 24 hour format to 12 hour format

      Convert java.util.Date to java.sql.Date in Java

      Convert java.sql.Date to java.util.Date in Java

      Get the current date, with the milliseconds removed

      Mastering Date-Time Formatting in Java with DateTimeFormatterBuilder

      Utility class to convert the time in double to different time formats like days, hours, minutes, seconds etc.,

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Convert Calendar to yyyy-MM-dd format

Using 'SimpleDateFormat', you can convert Calendar instance to 'yyyy-MM-dd' format.

Example

Calendar cal = Calendar.getInstance();

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");

String date = simpleDateFormat.format(cal.getTime());

App.java

package com.sample.app;

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class App {

 public static void main(String args[]) {
  Calendar cal = Calendar.getInstance();

  SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");

  String date = simpleDateFormat.format(cal.getTime());

  System.out.println("date : " + date);
  
 }
}

Output

date : 2020-01-25

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Get Calendar from Unix time stamp

Unix time is the number of seconds that have elapsed since 00:00:00, 1 January 1970, UTC, without counting the leap seconds.

You can get Unix time stamp by executing the command date '+%s' on terminal.

$date '+%s'

1577603360

Below snippet convers unix time stamp to Calendar.

Calendar calendar = Calendar.getInstance();

calendar.setTimeInMillis(unixTimestamp * 1000);

App.java

package com.sample.app;

import java.util.Calendar;

public class App {

 public static void main(String[] args) {
  long unixTimestamp = 1577603360;

  Calendar calendar = Calendar.getInstance();
  calendar.setTimeInMillis(unixTimestamp * 1000);

  System.out.println(calendar.getTime());

 }

}

Output

Sun Dec 29 12:39:20 IST 2019

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