SQL: Adding days to a date

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I am trying to add days to a date in SQL.  Sample application
Password last change date is logpwcd stored as a timestamp.
Password expiration interval is logpwei stored as a decimal.

Now I've got this big complex sql statement with the following in it:
(CURRENT DATE > (logpwcd+logpwei))
Evidently you can't add an integer to a timestamp.  Which makes sense
because it didn't know if it was a day, seconds, or whatever.
Trying
(CURRENT DATE > (logpwcd+days(logpwei)))
hurls with SQL0171-Argument 1 of function DAYS not valid.
-- DAYS, the argument must be a date or a timestamp.

Rob Berendt
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