Java Convert Date to Calendar Without Time

Tags: Java Date Java Calendar TimeUtil

In this Java core tutorial, we learn how to convert a Date object into a Calendar object without zero values for hour, minute, seconds, and milliseconds.

How to convert Date to Calendar without Time in Java

At this first step, we create a new Java class named TimeUtil, and implement a new method named convertDateToCalendarWithoutTime(Date date), in this method we follow these step to convert Date to Calendar.

  • Create a new Calendar object.
  • Use the Calendar.setTime(Date date) to set Date value to the above Calendar object.
  • Use the Calendar.set(int field, int value) method to set value of time to zero.

TimeUtil.java 

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

public class TimeUtil {

    /**
     * Convert a Date object to Calendar object without time
     * @param date the Date object
     * @return the Calendar object without time
     */
    public static Calendar convertDateToCalendarWithoutTime(Date date) {
        Calendar calendar = new GregorianCalendar();
        calendar.setTime(date);
        calendar.set(Calendar.MILLISECOND, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        return  calendar;
    }
}

In the following example Java program, we learn how to use the TimeUtil class above to convert a Date object to Calendar without time object.

ConvertDateToCalendarWithoutTimeExample.java 

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

public class ConvertDateToCalendarWithoutTimeExample {
    public static void main(String... args) {
        Date date = new Date();

        // Convert Date to Calendar Without Time
        Calendar calendar = TimeUtil.convertDateToCalendarWithoutTime(date);

        System.out.println("Date: " + date);
        System.out.println("Calendar: " + calendar);
    }
}
The output as below. 
Date: Sun Aug 14 17:42:03 ICT 2022
Calendar: java.util.GregorianCalendar[time=?,areFieldsSet=false,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Bangkok",offset=25200000,dstSavings=0,useDaylight=false,transitions=3,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2022,MONTH=7,WEEK_OF_YEAR=34,WEEK_OF_MONTH=3,DAY_OF_MONTH=14,DAY_OF_YEAR=226,DAY_OF_WEEK=1,DAY_OF_WEEK_IN_MONTH=2,AM_PM=1,HOUR=5,HOUR_OF_DAY=0,MINUTE=0,SECOND=0,MILLISECOND=0,ZONE_OFFSET=25200000,DST_OFFSET=0]

Happy Coding 😊

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