getting date from timestamp in PostgreSQL

Question

I have a PostgreSQL timestamp as

2009-12-22 11:01:46

I need to change this to date as

2009-12-22

So that I can compare the dates in postgreSQL

How can I achieve this transformation?

Answer 1

Cast it to date.

SELECT yourtimestamp::date;

If you need to extract other kinds of stuff, you might want to use EXTRACT or date_trunc

Both links are to the same page, were you'll find more date/time-related functions.