Re: Best way to convert "system timestamp format"

On 20/02/2010, at 10:47 AM, Paul Jackson wrote:

What is the current recommended method of converting a "system
timestamp" date (8 bytes) into a regular RPG native timestamp field?
I've seen a bunch of date and time API's/MI instructions out there so
was curious as to the best method to use.  I will be doing this
conversion many hundreds of thousands of times and so would be looking
for the quickest method (assuming there is a big difference between
them).

I've used QWCCVTDT before, should I just stick with that?

That's the easiest method but is likely slower than the MI version.
You would be trading ease for speed. The only way to know for sure is
to perform empirical tests but I suspect the call overhead to the API
will be measurable over "many hundreds of thousands" of iterations.

If you use the MI built-in _CVTD then you'll need to build appropriate
DDAT structures for the input and output dates. Not difficult but lots
of sub-fields to set and offsets to calculate correctly.

Search the archives for additional information on DDAT structures.