Compare dates ignoring milliseconds?

Question

Is there a way to compare two calendar objects, but ignore milliseconds?

I have written a test case that compared two calendar objects, but there is a p

Answer 1

I'd recommend using Joda Time if you are performing anything beside the basic date manipulations. In your case you can truncate the dates like so and then compare :

DateTime dateTime = new DateTime().millisOfDay().roundFloorCopy();

Answer 2

clearMilis(date1).compareTo(clearMilis(date2))


/**
 * @param date date
 *
 * @return truncated miliseconds
 */
@Nonnull
public static Date clearMillis(final @Nonnull Date date)
{
    DateTime result = new DateTime(date);

    return result.minusMillis(result.getMillisOfSecond()).toDate();
}

Answer 3

public static String getFromatDateTime(Date date) {
    SimpleDateFormat sdfDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
    final GregorianCalendar gc = new GregorianCalendar();
    gc.setTime( date );
    //gc.set( Calendar.HOUR_OF_DAY, 0 );
    //gc.set( Calendar.MINUTE, 0 );
    //gc.set( Calendar.SECOND, 0 );
    //block ignore millisecond 
    gc.set( Calendar.MILLISECOND, 0 );
    String strDate = sdfDate.format(gc.getTime());
    return strDate;
}
public static void main(String[] args) throws ParseException {
    SimpleDateFormat sdfDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
    Date now = new  Date();
    String currentDate = Testing.getFromatDateTime(now);
    String fullDate = "2015-12-07 14:53:39.30";
    String effDateStr = Testing.getFromatDateTime(sdfDate.parse(fullDate));

    System.out.println("Currennt Date: " + currentDate);
    System.out.println("Effective Date: " + effDateStr);
    System.out.println(currentDate.compareTo(effDateStr)==0);
}

Answer 4

Remove milliseconds from your calendar

cal.set(Calendar.MILLISECOND, 0);