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Conference noted::hackers_v1

Title:	-={ H A C K E R S }=-
Notice:	Write locked - see NOTED::HACKERS
Moderator:	DIEHRD::MORRIS

Created:	Thu Feb 20 1986
Last Modified:	Mon Aug 03 1992
Last Successful Update:	Fri Jun 06 1997
Number of topics:	680
Total number of notes:	5456

535.0. "calendar arithmetic" by WMVAXC::MAX_BRIDGE () Fri Aug 21 1987 15:37

    
    There must be numerous versions of date conversion routines
    that use sys$bintim to get a quadword date, perform some
    date arithmetic (e.g. subtract 5 days ( 5 * 86400 )) and
    sys$asctim to reformat to get dd-mmm-yyyy. 
    
    I have searched this note file and sw_tools for a copy.
    This type of calendar arithmetic should be posted somewhere?
    
                                   
    Or I'll write it again....

T.R	Title	User	Personal Name	Date	Lines
535.1		CADSYS::SLATER	Ken Slater	`Fri Aug 21 1987 16:26`	9
	In VMS V5.0, the RTL will provide extensive date manipulation functions. In the meantime, folks have been using LIB$ADDX, LIB$SUBX and LIB$EMUL to do things like you are asking for. I am not aware of any posted routines to do this. If you want to know more about the V5 routines, look at in BULOVA""::DOCD$:[50REVIEW.LPRDOC]NEWF_RTL_AX.LPR
535.2	NOTEFILE ERR	DREAMN::LORADITCH	Seems like the nothing, never was	`Fri Aug 21 1987 20:47`	5
	RE: .1 INVALID FORMAT FOR NOTEFILE WHEN OPENING NEWF_RTL_AX.LPR
535.3		NRADM2::MAXMGR	Al Cote	`Fri Aug 21 1987 23:42`	7
	It's an ASCII file containing documentation... try: $ COPY BULOVA""::DOCD$:[50REVIEW.LPRDOC]NEWF_RTL_AX.LPR []A.A $ PRINT A.A
535.4		BMT::KOZAKIEWICZ	You can call me Al...	`Tue Aug 25 1987 16:56`	6
	If you can't wait for V5, I have some MACRO routines, callable from FORTRAN (or any VAX language), which do some date arithmetic and logical functions. They should be real easy to clone to get the functionality you want if it is different from what I have. Let me know and I will be happy to post them here.
535.5	Don't call me Betty	DREAMN::LORADITCH	Seems like the nothing, never was	`Wed Aug 26 1987 19:32`	7
	re: .4 Thanks Al, I'd appreciate a posting.
535.6		BMT::KOZAKIEWICZ	You can call me Al...	`Mon Aug 31 1987 11:40`	195
	Here are the routines. The first two perform an unsigned subtraction or addition of a delta time value from/to an absolute value. Useful for figuring out "what would the time be 10 days and 4 hours from now", etc. Had I known about the LIB$SUBx type calls, I probably would have used them. I searched high and low through the MTH$ RTL routines and found nothing (which was no surprise since the VAX has no integer quadword arithmetic instructions), so I gave up. The last two routines are LOGICAL routines which do comparisons of absolute times. Use like : IF ( DATE_LE(abs_time1, abs_time2) ) THEN All arguments are quadword types except the result of the functions. I use REAL8 to hold binary time values, I am sure that any 8 byte entity would work (array of 8 BYTEs, array of 2 INTEGER4, etc.). To use, do an EXTRACT DATE.MAR from NOTES, edit the file to get rid of the header text, and do a MACRO DATE to produce the object. .TITLE DATE_ROUTINES - Date arithmetic support routines .IDENT /01.00/ .PSECT DATE_ROUTINES, PIC, EXE, REL, SHR, RD, NOWRT ;============================================================================== ; S U B _ D A T E ;============================================================================== ; General Electric Corporation ; NORYL Products Division ; Selkirk, N.Y. ; ;------------------------------------------------------------------------------ ; Author: Alan M. Kozakiewicz ; Version: 1.00 ; Date: 17-November-1986 ; ; Modification history: ; (ECO) (Date) (Who) ; ;------------------------------------------------------------------------------ ; Description: ; ; Called with CALLG instruction (AP => argument list). Performs ; an unsigned subtraction of a delta time value from and absolute time ; value and returns an absolute time value. P1 = P2 - P3 ;------------------------------------------------------------------------------ ; Inputs: ;------------------------------------------------------------------------------ ; Outputs: ;------------------------------------------------------------------------------ ; .ENTRY SUB_DATE,^M<> ; P1 = RESULT ; P2 = ABSOLUTE TIME ; P3 = DELTA TIME MOVQ @8(AP), @4(AP) ; Move absolute time to result MOVL 12(AP), R2 ; R2 point to delta time MOVL 4(AP), R1 ; R1 point to result MCOML (R2), (R2) ; Change delta time to absolute MCOML 4(R2), 4(R2) SUBL (R2), (R1) ; Subtract both halves SBWC 4(R2), 4(R1) RET ;============================================================================== ; A D D _ D A T E ;============================================================================== ; General Electric Corporation ; NORYL Products Division ; Selkirk, N.Y. ; ;------------------------------------------------------------------------------ ; Author: Alan M. Kozakiewicz ; Version: 1.00 ; Date: 17-November-1986 ; ; Modification history: ; (ECO) (Date) (Who) ; ;------------------------------------------------------------------------------ ; Description: ; ; Called with CALLG instruction (AP => argument list). Performs ; an unsigned addition of a delta time value and an absolute time ; value and returns an absolute time value. P1 = P2 + P3 ;------------------------------------------------------------------------------ ; Inputs: ;------------------------------------------------------------------------------ ; Outputs: ;------------------------------------------------------------------------------ ; .ENTRY ADD_DATE,^M<> ; P1 = RESULT ; P2 = ABSOLUTE TIME ; P3 = DELTA TIME MOVQ @8(AP), @4(AP) ; Move absolute time to result MOVL 12(AP), R2 ; R2 point to delta time MOVL 4(AP), R1 ; R1 point to result MCOML (R2), (R2) ; Change delta time to absolute MCOML 4(R2), 4(R2) ADDL (R2), (R1) ; Add both halves ADWC 4(R2), 4(R1) RET ;============================================================================== ; D A T E _ L E ;============================================================================== ; General Electric Corporation ; NORYL Products Division ; Selkirk, N.Y. ; ;------------------------------------------------------------------------------ ; Author: Alan M. Kozakiewicz ; Version: 1.00 ; Date: 18-November-1986 ; ; Modification history: ; (ECO) (Date) (Who) ; ;------------------------------------------------------------------------------ ; Description: ; ; Called with CALLG instruction (AP => argument list). Performs ; a comparison (unsigned) of the two arguments. Sets result (R0) to ; TRUE if (P1 .LE. P2). ;------------------------------------------------------------------------------ ; Inputs: ;------------------------------------------------------------------------------ ; Outputs: ;------------------------------------------------------------------------------ ; .ENTRY DATE_LE,^M<> CLRL R0 ; Set to FALSE MOVL 4(AP), R1 ; R1 => P1 MOVL 8(AP), R2 ; R2 => P2 CMPL 4(R1), 4(R2) ; IS P1 .LE. P2 ? BGTRU 20$ ; No way, GT BLSSU 10$ ; Yes, LT CMPL (R1), (R2) ; Check the low order if EQ BGTRU 20$ ; GT 10$: MOVL #1, R0 ; Set result to TRUE 20$: RET ;============================================================================== ; D A T E _ G E ;============================================================================== ; General Electric Corporation ; NORYL Products Division ; Selkirk, N.Y. ; ;------------------------------------------------------------------------------ ; Author: Alan M. Kozakiewicz ; Version: 1.00 ; Date: 18-November-1986 ; ; Modification history: ; (ECO) (Date) (Who) ; ;------------------------------------------------------------------------------ ; Description: ; ; Called with CALLG instruction (AP => argument list). Performs ; a comparison (unsigned) of the two arguments. Sets result (R0) to ; TRUE if (P1 .GE. P2). ;------------------------------------------------------------------------------ ; Inputs: ;------------------------------------------------------------------------------ ; Outputs: ;------------------------------------------------------------------------------ ; .ENTRY DATE_GE,^M<> CLRL R0 ; Set to FALSE MOVL 4(AP), R1 ; R1 => P1 MOVL 8(AP), R2 ; R2 => P2 CMPL 4(R1), 4(R2) ; IS P1 .GE. P2 ? BLSSU 20$ ; No way, LT BGTRU 10$ ; Yes, GT CMPL (R1), (R2) ; Check the low order if EQ BLSSU 20$ ; LT 10$: MOVL #1, R0 ; Set result to TRUE 20$: RET .END
535.7	translate, Please	MTBLUE::WILLIAMS_RIC		`Wed Dec 02 1987 07:39`	20
	I tried to use the previous routines (.6) to give me a one week advance notice of the events on my calendar data list, but I all I got was errors. I don't know how to pass the "AP => argument list" with a "R ADD_DATE". Unless it fits with "^M<>" in some that I haven't tried. Could you give me a more specific example of the syntax necessary to compare an entry from a date list, to (today + 1 week)'s date; I'm not much of a programer, and I'm certainly no Hacker, but I sure would like to get this feature installed in my auto-appointment reminder. Dick
535.8		BMT::KOZAKIEWICZ	Shoes for industry	`Sun Dec 06 1987 23:36`	17
	If I were a FORTRAN programmer (which I are, so what?), a code segment might look like this: REAL8 NOW ! Will hold todays date REAL8 DELTA ! Will hold increment REAL8 FUTURE ! Will hold result CHARACTER27 STR CALL SYS$BINTIM('-- ::.',NOW) !Get the date/time now CALL SYS$BINTIM('7 12:00:00.00',DELTA) !7 Days and 12 hours into the C future CALL ADD_DATE (FUTURE, NOW, DELTA) CALL SYS$ASCTIM (, STR, FUTURE, ) ! Convert to ASCII TYPE *, STR ! Print out result
535.9	THANKS	MTBLUE::WILLIAMS_RIC		`Mon Dec 07 1987 05:14`	4
	re: .8 Thanks, I'll try it.