php - addtime with more than two and mixed argument -


i making work time tracking database needs calculating on work hours well.

the simple operation possible through.

addtime(`starttime`,-`endtime`)

but need calculations on more numbers fail.

say work can span on midnight , starttime: 20:00:00 , endtime 06:00:00 like:

if(`starttime`<`endtime`, addtime(`endtime`,-`starttime`),addtime(`endtime`, addtime (-`starttime`,24:00:00))) tid 1

but isn´t accepted.

and when need add in possibility lunch break gets more complicated.

what do?

to keep calculations simple, i'd suggest along start , end times, store start , end dates, in same field. doing so, can find working hours doing below in mysql query:

timestampdiff(hour, `start_datetime`, `end_datetime`);

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