Time (from xx:xx - to xx:xx ) in PHP
<p>I am trying to have to dropdown lists which would contain 12-hour clocks. Those two represent the from list, and the to list. The user basically uses those to specify their availability time.</p>

<p>I am trying to figure out how to validate that the time span is valid. Any ideas with this?</p>

<p>I am willing to change the whole concept if you have any ideas.</p>

<p>Thanks!</p>
