Filtering hours entered with Date & time picker

I have created a time sheet app and I would like to be able to select for example only lunch break hours and overtime hours and count them.
To do so I would like to say :
For lunch break : if current event contains 12:00 to 13:00 count 1.
For overtime : if current event contains hours after 19:00 count number of hours …
How could I do that ?
Does anyone have a trick ?


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