Php date and time function


I’m busy with my new website and want to do some things with “date”.

I would like to create a function in my site that shows/hides a product based on date.

For example in the field “show” i put the date 2009-04-19 and from that date the product will be shown. If i put in the “hide” field the value 2009-04-21 the product must be hidden from the 21st.

Is this possible in a easy way?