Find out the time between two timeslots?
<p>I have two times start_time=2009-12-01 9.30 pm and end_time=2009-12-01 11.30 pm(YYYY-MM-DD).If the user do any activity between these times ie at 2009-12-01 10.30 pm I need to tell him you are not valid to do this activity...
The two times 2009-12-01 9.30 pm  and 2009-12-01 11.30 pm is taken from database.The time 2009-12-01 10.30 is given by user.</p>

<p>My question is how can I find the time 10.30pm is occured inbetween 9.30pm to 11.30pm...</p>

<p>I do my program in PHP</p>
