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Subject: TOD clock and the year 2043

Does anyone have a set of Assembler routines that convert from a
TOD clock value to a date and time?  Is it as easy as getting the
clock value into a pair of registers, shifting the pair of registers
to the right 12 bits to get the number of micro seconds since January,
1, 1900, divide that by 1000000 to convert to seconds and then calculate
the year, month, day, hours, minutes, and seconds since 1/1/1900
without forgetting about leap years?  Although there sounds like quite
a few steps none of the steps are very difficult.  I would be interested
in seeing routines that anyone else has that they would be willing
to share.

We are in the process of rewriting all of our date routines.  They
will all break before the year 2000.  Way back when these routines were
written the programmers never imagined that they would still be in
production through the 90's.  We have been asked to rewrite these
routines so they will never break.  We have run into a small problem
that I am not sure how to resolve.  From the TOD clock we can calculate
the date and time.  According to Principles of Operations, TOD clocks will
wrap in approximately the year 2043.  How can you calculate a date with
a century after the year 2043?  If the TOD clock wraps in the year 2043
how can we calculate the current century.  Does anyone have any
suggestion on how to get the century after 2043?  Is everyone going to
retire before 2043 and really don't care?  Any help would be appreciated.



Thanks,

Martin J. Doyle
VM Systems Programming Contractor
Rohm and Haas Company
Philadelphia,  Pennsylvania
MBDMD@ROHVM1
(215) 752-2296