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APENDIXD.DOC
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1987-10-20
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Appendix D: DATECALC, a RAM Resident Date Calculator Utility
The program DATECALC.COM that has been placed on your Family History
System program diskette (or in the \FAMILY sub-directory of your hard
disk) is a program to assist you in performing some standard opera-
tions involving dates, including:
Determining the day of the week on which a given date falls;
Computing the number of years, months and/or days between two
given dates;
Determining the date that is a given number of years, months
and/or days before or after another date;
Displaying a calendar for the month containing a given date;
Converting between "old style" and "new style" dates.
In providing these functions, the DATECALC utility also permits you to
select the format for dates entered or displayed from among:
DD MON YYYY (e.g. 10 APR 1943)
MON DD, YYYY (e.g. APR 10, 1943)
MM-DD-YYYY (e.g. 04-10-1943)
DD.MM.YYYY (e.g. 10.04.1943)
YYYY MM DD (e.g. 1943 04 10)
or YYYY DDD (e.g. 1943 100).
The "difference" or length of interval between dates can be displayed
in several formats also, including:
+/- Yr,Mon,Day (+ 0044 Y 004 M 02 D)
+/- Yrs,Days (+ 0044 Y 124 D)
or +/- Days (+ 016195 Days).
(A "-" before the date difference indicates that the second date
occurs before the first one.)
The DATECALC utility can be invoked in several ways. If you are using
DOS 2.1 or later and have sufficient RAM on your machine, you should
be able to invoke it from the MainMenu of the Family History System
by pressing the F7 key. It can also be executed as a command from the
DOS prompt, for example by entering: A>datecalc
assuming the DATECALC.COM program is on the diskette in the "A" drive.
Finally it can be made memory resident by entering: A>datecalc r
(again assuming the DATECALC.COM program is on the diskette in the "A"
drive) after which it may be called up at just about any time by
simultaneously pressing the ALT and CTRL keys. The utility will not
"pop up" when the screen is being used to display graphics and it may
be incompatible with some other resident utilities or with some
programs which take control of keyboard input.
The AUTOEXEC.BAT file created on program diskettes during the standard
INSTALL procedure has a command line in it which will make this
utility memory resident when you boot from those diskettes. If you
are running from a hard disk or do not boot from your Family History
System program diskette, you may consider modifying the AUTOEXEC.BAT
file used during your normal boot procedure to automatically make the
DATECALC utility RAM resident. Be aware that making the program
resident in memory will "permanently" reduce the available memory for
other programs by about 7k.
(See file DATECALC.DOC on compiled program diskette for full text
of APPENDIX D.)
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