Add two time variables then add an hour

I'm very frustrated I can't get this to work since it seems so easy.  I have two time variables in my databases
SCHTM and DURATION

I need to add these two together, then add one hour.

I have this adding the two variables correctly and displaying in the format I need:
$TotTime = strToTime($SCHTM) + strToTime($DURATION) - strToTime("00:00:00");  
$TTF= date("H:i", $TotTime);

But whenever I try to add one hour, it messes things up.
BHUCAsked:
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BHUCAuthor Commented:
I found it!  $TTF = date(" H:i", strtotime('+1 hours', $TotTime));
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BHUCAuthor Commented:
Found the answer myself before anyone could answer. I knew it was simple....
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