calculation of pay based on dates

Hi ...

I want to fix the pay based on joining date and antedate...antedate is
the last date...

Joining date is 01-07-2007

Antedate is 04-07-2007..

On joining date I will fix the pay but before fixing the pay I will
check whether antedate is there or not, if its there then I will see
difference between 2 dates..if difference is 2 years then I will fix the
pay with increments...if difference is less than 2 years then I will fix
the pay with out increments...

Take an example of above 2 dates..there is no 2 years difference between
two dates...

01-07-2007 I will fix the pay...after 3 days current date =
antedate...so again I have to fix the pay with out my intervention...

Is there any jobs or schedules or triggers to call that function when
current date and antedate is equal...

Any one can help on this... I need it very soon....

Regards
Penchal

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