[RESOLVED] Subtract Hours from Timestamp

Arc

Hey guys. I have a timestamp that looks like this 05/03/2007 07:35 PM and I need to subtract/add a certain amount of hours from/to it depending on the time zone the person is in who is looking at it.

For instance, to give you an idea of the logic I am looking for


function FormatTimeZone(timeStamp,numHoursChange,subtract)
{

   if(subtract == true){

//subtract numHoursChange from timeStamp

   }else{

//add numHoursChange to timeStamp

   }//end if

}//end function

if($timeZone == 1) $newTime = FormatTimeZone($timeStamp,$numhours,true)

The part I can't figure out is how to take into account changes in the Date and changes in AM or PM.

For instance if I had the time stamp 05/03/2007 07:35 PM and I wanted to subtract 12 hours the function would return 05/02/2007 07:35 AM....

Is this too hard to do? Or are there some built in PHP functions that can handle this?

Thank a lot guys!

Installer

"05/032007 07:35 PM" minus 12 hours is "05/03/2007 07:35 AM", not "05/02/2007 07:35 AM"

return date('m/d/Y H:i a', strtotime($timeStamp . ' -' . $numHoursChange . ' hours'));  // or ' +'

From where do you get a "timestamp" like that?

Arc

Hey Installer, thanks for the help. You are right Ihad the AM/PM mixed up, I ment to say, "...if I had the time stamp 05/03/2007 07:35 AM and I wanted to subtract 12 hours the function would return 05/02/2007 07:35 PM".

Your code does subtract the hours, however it returns Military time. For instance 05/03/2007 10:31 PM is returned as 05/03/2007 22:31 pm.

I am trying to figure this out on my own, but if you can help me out I appreciate it.

Also, is there anyway to format the am-pm to Caps like AM-PM? Without me having to parse the string and do it manualy?

Thanks mate!

Arc

Never mind, I fiured out the "H" just needed to be a"g". Thanks again!