Set date to the start of a minute

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

public class Main {
  public static void main(String[] argv) {
    System.out.println(getStartOfMinute(new Date()));
  }

  public static Date getStartOfMinute(Date day) {
    return getStartOfMinute(day, Calendar.getInstance());
  }

  public static Date getStartOfMinute(Date day, Calendar cal) {
    if (day == null)
      day = new Date();
    cal.setTime(day);
    cal.set(Calendar.SECOND, cal.getMinimum(Calendar.SECOND));
    cal.set(Calendar.MILLISECOND, cal.getMinimum(Calendar.MILLISECOND));
    return cal.getTime();
  }
}