$sMsg = '2017-09-04 18:42:38'
_DateDiff ('h', $sMsg , _NowCalc() )
I could not find anything recent, so I thought I would put it here.
The '2017-09-04' date is a typical SQL timestamp. The _NowCalc() is a typical AutoIt date calculator. Much to my surprise and delight, _DateDiff works correctly with these two dates without any prior conversion.
I am guessing that internally the separating characters (-/) get ignore.
Does save on additional code.
Skysnake