ts@uwasa.fi (Timo Salmi LASK) (04/07/90)
In article <13000001@uxh.cso.uiuc.edu> mead@uxh.cso.uiuc.edu writes: >QUERY: Does anyone know of *any* source for an intelligent algorythm >for getting the day ('Monday, Tuesday, ...') from the date (4/3/90). >My PC does it like lightning each time I issue the 'DATE' command, and >if IBM can do it, anyone can - right? :) Textbooks or whatever are >fine, but please don't direct me to existing software unless it's PD >source code (in BASIC, C, Pascal, or FORTRAN). Thanks. Ok, I won't direct you anywhere :-), but if anyone else has the same problem, there is an unit in (/pc/ts/)tspas18.arc to do just this. Available by anonymous ftp from chyde.uwasa.fi. ... I'll backtrack a bit. Also see Press & Flannery & al: Numerical Recipes, Cabridge University Press. Hope this helps. (Incidentally, this has been a very frequently asked question, but for some reason it has been dormant for a few months, kinda lying low, biding its time, or whatever. You wouldn't believe how many messages we had about this way back when.) ................................................................... Prof. Timo Salmi (Moderating at anon. ftp site 128.214.12.3) School of Business Studies, University of Vaasa, SF-65101, Finland Internet: ts@chyde.uwasa.fi Funet: gado::salmi Bitnet: salmi@finfun
mead@uxh.cso.uiuc.edu (04/07/90)
Sorry if you caught this in another group (but then why did you look at
this one?).
I am writing a simulation in which the user will get (simulated)
"memos". These memos will have embedded symbols which my code shall
have to expand into appropriate dates (eg, @d3 might get expanded to
the string, 'Tuesday April 3, 1990' - the date three days before I'm
writing this note. Tomorrow, it would be expanded to 'Wednesday April
4, 1990', ...).
QUERY: Does anyone know of *any* source for an intelligent algorythm
for getting the day ('Monday, Tuesday, ...') from the date (4/3/90).
My PC does it like lightning each time I issue the 'DATE' command, and
if IBM can do it, anyone can - right? :) Textbooks or whatever are
fine, but please don't direct me to existing software unless it's PD
source code (in BASIC, C, Pascal, or FORTRAN). Thanks.
-alan mead : mead@uxh.cso.uiuc.edun257cl@tamunix.tamu.edu (Sean Malloy) (04/13/90)
As I said to Mr. Mead, there is a DOS service function available to you that does this automatically. Set AH = 2Ah (decimal 42) Use interrupt 21h (decimal 33). Register AL now contains a number (0-6) which corresponds to Sunday - Saturday. Register CX will contain the year, and DH contains the month # and DL contains the day #. I'll leave it up to one more experienced in linking assembly to PASCAL to explain how to accomplish this in PASCAL. Perhaps you can use a Pascal Command to check the contents of your registers? Best of luck with this (shorter) method... -Sean