Re: Date formats (was Frank Doherty will be back on Tuesday (all being well))

It should also be pointed out that this technique is a horrendously
poor performer in comparison to for instance moving DS subfields.

Additionally, it won't work by default with the RPG IV EVAL op-code.

Coupled with it's inherent tricky-ness and I'd stay far, far away!

I remember it took me a not insignificant amount of time to figure out
what was going on when I first came across it.

Charles

On Mon, Dec 14, 2009 at 1:48 PM, Terrence Enger <tenger@xxxxxxxxxxxxxxxx> wrote:

On Mon, 2009-12-14 at 13:25 -0430, Luis Rodriguez wrote:

Just curious, Would you care to elaborate on that conversion method?

Well, assume that mm, dd, and yy are pairs of decimal digits and you
have a field with value mmddyy. ÂMultiplication by 10000.01 gives you,
writing it out as what we used to call "long multiplication" ...
ï Â Â Â Âmmddyy
   x 10000.01
 Â-------------
 Âmmddyy0000
    Âmmdd.yy
ï Â Â-------------
 Âmmddyymmdd.yy
 Â=============
Truncate product at both ends into a 6-digit field, and you have
yymmdd.

This clever-ugly trick lets you do the conversion in one line. ÂBack on
S/34 and S/36, I often deemed the economy of lines worth the
clever-ugliness. ÂMy memory is fading: ÂI cannot remember what method
produced the smallest object code on S/32.

To convert the other direction, use a multiplier of 100.0001. ÂExcept,
please, please don't <grin />.

Cheers,
Terry.


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