Does anybody really know what time it is...? ;-)
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Alan Shore
Sent: Thursday, November 29, 2007 4:40 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: 00:00:00 or 24:00:00
"fortunately, we only have a second to think about it and it is gone."
Unlike this thread 8-)
Alan Shore
NBTY, Inc
(631) 244-2000 ext. 5019
AShore@xxxxxxxx
"If you're going through Hell, keep going" - Winston Churchill
"John Arnold
(MFS)"
<jarnold@medicalf
To
undingservices.co "RPG programming on the AS400 /
m> iSeries" <rpg400-l@xxxxxxxxxxxx>
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Subject
RE: 00:00:00 or 24:00:00
11/29/2007 04:31
PM
Please respond to
RPG programming
on the AS400 /
iSeries
<rpg400-l@midrang
e.com>
As was stated many times yesterday January 1, 2000 00:00:00 is the same
as January 1, 2000 24:00:00 - the reason is that there really is no zero
in time computation.
The truth is zero hour does not exist, only 2400 exists, however, 2400
is the end of the day so there is no time of 24:00:01 - that time is
expressed as 00:00:01 thus leading one to believe that 00:00:00 exists.
If the zero hour existed, it would be the first marker in the next day
but since it does not exist time always moves from today at 24:00:00 to
tomorrow at 00:00:01 - fortunately, we only have a second to think about
it and it is gone.
John Arnold
(301) 354-2939
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of qsrvbas@xxxxxxxxxxxx
Sent: Thursday, November 29, 2007 4:18 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: Re: 00:00:00 or 24:00:00
Peter.Colpaert wrote:
1. 00:00:00 or 24:00:00 (Peter.Colpaert)
One of our processes involves parsing a directory listing of a windows
shared drive, and there are 6 files which cause problems.
These files have an entry in the listing as follows:
01/01/2000 12:00a 438,082 GN0229084.JPG
The listing is parsed by two different programs (one made by me, the
other made several years ago by another developer).
His program (using pre-bif methods) returns the time as 00:00:00,
whereas mine (using the %time built-in function) returns 24:00:00
First of all, I'd like to know whether January 1, 2000 00:00:00 is the
same as January 1, 2000 24:00:00 (I would think that the latter
actually means January 2).
(I know, this was beaten into the ground; but I gotta add my opinion
after just getting back...)
My purely personal opinion is that hour '24' cannot be valid. Hour '24'
implies that hour '24' has minutes '00' through '59' and the time
'24:15' doesn't exist. True, the implication is a logical one, not
enforced by standards. But programming should have a logical foundation.
(Ignoring Daylight Saving Time, leap-years, etc., since we need to
handle all special cases as... "special cases" anyway.)
Also, when comparing hours with minutes or seconds, why would anyone
expect hours to range up to '24', but minute '60' and second '60'
wouldn't be allowed? Minutes and seconds start at '00', so hours should
be consistent. Is '24:60:60' a valid time? If so, what time is it?
IMO, hour '24' ought to be tossed onto the heap of discarded nonsense.
Much like division by zero...
Also, "12noon" must be /neither/ AM nor PM. The conceptual use of 'AM'
is 'before noon' (ante meridiem) and 'PM' is 'after noon' (post
meridiem). "Noon" can be neither 'before' nor 'after' "noon".
Similarly, "12midnight" is 'special'. "Noon" is not part of the morning
nor part of the afternoon; it is the point that marks the boundary
between them. (Is your property line part of your property?
or your neighbor's?) But I'm totally lost on what that means. Sigh.
Purely opinion, not based upon expertise with standards.
Tom Liotta
--
Tom Liotta
The PowerTech Group, Inc.
19426 68th Avenue South
Kent, WA 98032
Phone 253-872-7788 x313
253-479-1416
Fax 253-872-7904
http://www.powertech.com
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