The moose likes Beginning Java and the fly likes how to determine if two Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "how to determine if two "Date" are same ?" Watch "how to determine if two "Date" are same ?" New topic

how to determine if two "Date" are same ?

ben oliver
Ranch Hand

Joined: Mar 28, 2006
Posts: 375
If I create two java util Date objects, and set them to the same "real day", in JVM they are two different objects. But how do I tell if they actually contain the same "actual real day" ?
fred rosenberger
lowercase baba

Joined: Oct 02, 2003
Posts: 11955

how about trying the equals() method of the Date class?

There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
Paul Beckett
Ranch Hand

Joined: Jun 14, 2008
Posts: 96
the equals method tests equality right down to the millisecond.

I've just been doing some date/time calculations recently and remembered very quickly how much of a pain the standard java implementations are.

If you are ok using other API's then something like DateUtils from apache commons lang may be of use. It contains an "isSameDay" method.

Other than that you will probably need to use the java.util.Calendar to produce a Date with the non relevant fields (hour/minute/second/millisecond) all set to zero. Then you should be able to do an equals comparison on your 2 'day only' dates.
I agree. Here's the link:
subject: how to determine if two "Date" are same ?
It's not a secret anymore!