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Buck wrote:
Tom wrote:
I would have thought that *CYMD was primarily for support of date
parameters from *CMDs where the CPP was written in RPG. I wouldn't have
expected that it would be used often for persistent storage.
There are several packages that use *CYMD. Cool:2E (formerly known as
Synon) used that format too. The packages and Synon predate the advent
of true date data types.
I don't doubt it. I was thinking more of IBM's driving motivation
for creating the format in the first place. I can't guess at the
motivations of developers who used it as an application attribute.
Date fields aren't perfect, in particular the validity checking is
unusual for RPG programmers.
Many years back, I was using QWCCVTDT as my fundamental
validity-checker for dates. It wasn't always a straightforward API
to use; but I always figured it's better to have IBM on the hook for
making it work. If nothing else, it gave a reliable indication of
validity.
Once a date is known to be "valid" as an actual date, there might be
other tests such as within a range of dates, after specific
day-of-month or whatever. But the additional tests are generally
'business rules' rather than according to common standards.
I'm not sure what to say about developers who can't implement
'business rules' in the language that they work in.
Tom Liotta
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