Resetting the time part of a timestamp in Java

Question

In Java, given a timestamp, how to reset the time part alone to 00:00:00 so that the timestamp represents the midnight of that particular day ?

In T-SQL, this query

Answer 1

Here's a simple function with a main example:

import java.util.Calendar;
import java.util.Date;
public class Util {
/**
 * Returns an imprecise date/timestamp. 
 * @param date
 * @return the timestamp with zeroized seconds/milliseconds
 */
public static Date getImpreciseDate(Date date) {
   Calendar cal = Calendar.getInstance(); // get calendar instance
   cal.setTime(date);// set cal to date
   cal.set(Calendar.SECOND, 0); // zeroize seconds 
   cal.set(Calendar.MILLISECOND, 0);   // zeroize milliseconds
   return cal.getTime();
}

public static void main(String[] args){
   Date now = new Date();
   now.setTime(System.currentTimeMillis()); // set time to now
   System.out.println("Precise date:  " + Util.getImpreciseDate(now));
   System.out.println("Imprecise date:  " + Util.getImpreciseDate(now));
}
}