Update Record with a similar funtion to dateadd

I have a field in my sybase database that holds dates in an interger format. So for example todays date would be 13342 in that field.

I already know how to read that field in a regular date format.

select dateadd(dd, reactivate_date, '1Jan1970') from requests .....

So anything in the reactivate_date column gets returned as a proper date.

I would like to know, how would I take a proper date and convert it back to the number so I can update that particular field using the companies date structure.

Thanks.
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nplibAsked:
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Jan FranekConnect With a Mentor Commented:
You need to use datediff function - it is in fact inverse function to dateadd:

for example - this will update reactivate_date with today's date in integer format:

update requests
set reactivate_date = datediff( dd, '1Jan1970', getdate() )
where ...
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