Date caclulations -- RPG400-L

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This is a newbie questions so please take it easy on me, everyone has to
start somewhere. I have no manuals available to me (offline), just text
books which yielded no suggestions.

I need to know if it is possible to subtract two dates (which will be
retrieved from an input file as numeric 8 digit fields (yyyymmdd)) and get a
numeric answer.  For instance, input fields with numeric values -
ShipDate = 20000808 and ReqDelivDate = 20000804, I would like to have 4 as
my result.

I think it can be done with julian dates somehow but I do not know how to
convert a numeric field to a julian date field.

Your assistance is greatly appreciated.

Kat W

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