Calculation every 24 hours

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C#

MySQL

C#4.0

Basicly Evry 24 hours i need to calculate total work time etc from a database

ID | date       | tijd    | empoyeeID(foreighn)
1  | 2014-03-03 | 14:00:00| 0
2  | same date  | 15:00:00| 0 

...
( they are basicly registrations 1 = start 2 = stop 3= start 4 = stop)
so for every date i need the start time and stop time total time worked

should i calculate that with MySql Or c#

should i hook the internal windows time
should i use timers

what dou you guys think is the best aproach


soz bad england I aint a native english speaker ;)

ps. i have written evrything for the single registrations (see table at start of post)