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Re: 24 or 6 To Four

 

Coz they is American :)

On 28/07/2022 00:18, Robert Prins wrote:
Why don't you use 24 hour times?????????

On Tue, 26 Jul 2022 at 00:02, Drew Derbyshire <swhobbit@...> wrote:

A bit pf trivia ...

Long ago and far away, I worked at Link Flight Simulation of the
Singer Company; we ran MVS/SP on an IBM 4341. There, on the week
of 8 June 1984, an operator blew the Julian date when doing an IPL
by flipping two digits. This jumped the date forward ~ 3 months
and THAT caused the tape library scratch processing to have a
field day and threaten to wipe out good chunk of our tape
library.? (The librarians caught it promptly, thank goodness.)

I know the week because on that date I cranked out a simple
program that was started immediately after IPL and displayed on
the console a non-scrollable line similar to:

@LDCTODAY: Monday, 25 July 2022 (22.206)

This of course made it easy for the operator to promptly see the
error of their ways.

Because I'm prone to not check the time when I IPL MVS 3.8 (after
all it is slaved is to the NTP-controlled Hercules host clock
except for the timezone), I recently played with the program and
its underlying date routine to expand the output to report the
time and timezone, and as a bonus I tossed in a second message
with the GMT date and time:

@LDCTODAY: Monday, 25 July 2022 (22.206)? 9:36:19 AM -0700
@ Monday, 25 July 2022 (22.206)? 4:36:18 PM GMT


The times sources are generated by the OS TIME macro invoked twice
back-to-back:

TIME DEC,ZONE=LT???????? Get current local time ...
???? ST R0,LCLTIME
???? ST R1,LCLDATE
???? SPACE 1
???? TIME? DEC,ZONE=GMT??????? ... also get current GMT time ...
???? ST R0,GMTTIME
???? ST??? R1,GMTDATE

Now knowing you did not look closely at the program output, back
up and look at it carefully.

Like how time flows backwards?? My uninformed guess is a truncate
issue deep in MVS with the conversion from timer units to
seconds*100 and then the hundredths are dropped.

(My time working in RBOC class voice mail has taught me well: NO
lossy conversion goes unpunished.)

-ahd-

--
Drew Derbyshire

AAAAAA - American Association Against Acronym Abuse Anonymous.



--
Robert AH Prins
robert(a)prino(d)org
The hitchhiking grandfather <>
Some REXX code for use on z/OS <>
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