HP Forum Archive 15

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HP-41 Date to Week / Week to Date conversion Message #1 Posted by Geir Isene on 18 Feb 2006, 6:29 p.m. Here's a program that converts a date to the ISO week number and a week number to the starting date of that week (monday as specified by ISO). It takes the date in the normal format. The week number to be converted to the date (monday) can be WW for the current year or WW,YYYY for any year. D-W obviously converts a date to the ISO week number while W-D naturally does the reverse. 001 *LBL "D-W" 002 ENTER 003 ENTER 004 XEQ 01 005 X<>Y 006 DDAYS 007 7 008 / 009 2,1 010 + 011 INT 012 RTN 013 *LBL "W-D" 014 ENTER 015 INT 016 X NE Y? 017 SF 05 018 2 019 - 020 7 021 * 022 FS?C 05 023 GTO 02 024 DATE 025 LBL 03 026 XEQ 01 027 X<>Y 028 DATE+ 029 RTN 030 LBL 01 031 100 032 * 033 FRC 034 100 035 / 036 4,01 037 + 038 ENTER 039 DOW 040 8 041 - 042 CHS 043 + 044 RTN 045 LBL 02 046 X<>Y 047 FRC 048 100 049 / 050 1,1 051 + 052 GTO 03 053 END

Re: HP-41 Date to Week / Week to Date conversion Message #2 Posted by Karl Schneider on 18 Feb 2006, 10:18 p.m., in response to message #1 by Geir Isene Geir -- Thank you for the contribution, but I think it needs some more work before it is ready for the MoHPC HP-41 Software Library. You should mention that the program requires an HP-41CX or an HP-41C/CV with Time Module. What is "date in the normal format"? We use MM.DDYYYY in the US, but Europe uses DD.MMYYYY. The Time Module and the HP-41CX support both. (Flag 31 clear = MDY; Flag 31 set = DMY). Also, several examples would be helpful. I get -12 as the answer, running "D-W" for MM.DDYYYY = 12.182006. That doesn't seem correct, but the program was entered correctly. Regards, -- KS

Program submissions Message #3 Posted by Vassilis Prevelakis on 19 Feb 2006, 12:19 a.m., in response to message #2 by Karl Schneider I'd encourage people developing programs intended for release to the community to use the old HP program library submission forms. Look in any "Users's library solutions book" in the MoHPC DVD for the format. ----------------------- Karl Schneider wrote: > I get -12 as the answer, running "D-W" for MM.DDYYYY = 12.182006. > That doesn't seem correct, but the program was entered correctly. The program assumes dates in the European format (DD.MMYYYY). As Karl suggested, the program should check flag 31 and behave accordingly. **vp

Re: Program submissions Message #4 Posted by Geir Isene on 19 Feb 2006, 3:55 a.m., in response to message #3 by Vassilis Prevelakis Quote: I'd encourage people developing programs intended for release to the community to use the old HP program library submission forms. Releasing it here makes it possible to get feedback on it (like the flag 31). Thanks.

Re: Program submissions Message #5 Posted by Vassilis Prevelakis on 19 Feb 2006, 7:20 a.m., in response to message #4 by Geir Isene Geir Isene wrote: > Releasing it here makes it possible to get feedback on it (like the flag 31). By all means. My comment was not about posting here. In fact I think this is the best place to post new programs. I was talking about the format of the submission. Specifically, that by following the HP User Library layout you are helped to provide all the info that users will require. For example, the forms include a section describing the input, another with examples of use, etc. A lot of the programs in the Solution books were submitted to the program library by the user community. Best Regards **vp

Re: Program submissions Message #6 Posted by Geir Isene on 19 Feb 2006, 9:03 a.m., in response to message #5 by Vassilis Prevelakis Ah, point taken. I do that on more involved programs. Had the idea that this little conversion needed no such "overhead". But at the same time I am a "standardization maniac", so I'll adopt it for all my programs.

Re: HP-41 Date to Week / Week to Date conversion Message #7 Posted by Geir Isene on 19 Feb 2006, 2:22 p.m., in response to message #2 by Karl Schneider Quote: What is "date in the normal format"? We use MM.DDYYYY in the US, but Europe uses DD.MMYYYY. The Time Module and the HP-41CX support both. (Flag 31 clear = MDY; Flag 31 set = DMY). The program now supports both date conventions. Bear in mind that it does however show the first monday of the week when you enter the week number and execute "W-D". This is according to the ISO week number specification. Quote: Also, several examples would be helpful. Enter (in DMY mode): 2,012006 XEQ'D-W and you get: 1 Enter (in MDY mode): 11,2007 XEQ'W-D and you get: 3,122007 Enter (in MDY mode): 11 XEQ'W-D and you get: 3,132006 Quote: I get -12 as the answer, running "D-W" for MM.DDYYYY = 12.182006. That doesn't seem correct, but the program was entered correctly. Fixed: 001 *LBL "D-W" 002 ENTER 003 ENTER 004 XEQ 01 005 X<>Y 006 DDAYS 007 7 008 / 009 2,1 010 + 011 INT 012 RTN 013 *LBL "W-D" 014 ENTER 015 INT 016 X NE Y? 017 SF 05 018 2 019 - 020 7 021 * 022 FS?C 05 023 GTO 02 024 DATE 025 LBL 03 026 XEQ 01 027 X<>Y 028 DATE+ 029 RTN 030 LBL 01 031 100 032 * 033 FRC 034 100 035 / 036 FC? 31 037 1,04 038 FS? 31 039 4,01 040 + 041 ENTER 042 DOW 043 8 044 - 045 CHS 046 DATE+ 047 RTN 048 LBL 02 049 X<>Y 050 FRC 051 100 052 / 053 1,1 054 + 055 GTO 03 056 END

Re: HP-41 Date to Week / Week to Date conversion Message #8 Posted by Karl Schneider on 23 Feb 2006, 10:51 p.m., in response to message #7 by Geir Isene Geir -- Thank you for the improvements to your program. If you submit it to the MoHPC HP-41 Software Library, you could pick one of the a better templates for formatting the posting. -- KS

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