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ISO8601 · To bring the International Date and Time Format to the attention of the Internet world and beyond.
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UTC didn't exist before 1961   Message List  
Reply | Forward Message #2172 of 2202 |
All the parts of the standard that discuss Universal Time or time zones
specify that everything is based on Coordinated Universal Time (UTC).
But UTC didn't exist before 1961, and didn't assume its present form,
with an integer number of seconds difference between International
Atomic Time (TAI) and UTC until 1972. So isn't it formally incorrect to
use the Z indicator or a time zone offset before 1961?

For the relationship between TAI and UTC see
http://hpiers.obspm.fr/eoppc/bul/bulc/UTC-TAI.history
Wed Feb 18, 2009 3:48 pm

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pqrc96
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Forward 		Message #2172 of 2202 |
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All the parts of the standard that discuss Universal Time or time zones specify that everything is based on Coordinated Universal Time (UTC). But UTC didn't... 		pqrc96
Offline Send Email 		Feb 28, 2009
8:14 pm

8601 also requires the use of the Gregorian calendar, which did not exist prior to 1582, for all dates. It is easy to extrapolate back. For time, the concept...
johnmsteele
Offline Send Email 		Mar 1, 2009
12:59 am

Some people who write in Wikipedia are interested in using microformats to provide a machine-readable version of important dates and times, in the hopes that...
pqrc96
Offline Send Email 		May 23, 2009
6:56 pm

In a very strict technical sense it may have been overlooked. However, prior to atomic clocks, you have to relax the formality of beating in synch with atomic...
johnmsteele
Offline Send Email 		May 23, 2009
10:26 pm

I don't see a problem....
piebaldconsult
Offline Send Email 		May 25, 2009
3:58 am

Did the responses answer your question sufficiently? The problem(s) are not really with the standard. As you go back in time, UTC doesn't exist, time zones...
Tex Texin
textexin
Offline Send Email 		May 25, 2009
8:31 am

Right. Doesn't the standard call for a proleptic Gregorian calender for dates before 1582 & after the present (and that more digits/negative dates are allowed...
nguyenivy@...
ali0917
Online Now Send Email 		May 25, 2009
8:53 am

... Yes, but seconds generally aren't important in day-to-day events anyway. If you're going to try to calculate an offset to great precision you may need to...
piebaldconsult
Offline Send Email 		May 26, 2009
2:09 pm

I was thinking of historical examples like the offset The Netherlands used sometime in the last 100 years that had an offset precise to the centisecond....
nguyenivy@...
ali0917
Online Now Send Email 		May 26, 2009
11:35 pm

I started this thread. After seeing the responses, I don't really see anything that would change my ideas, but knowing that my thoughts have been reviewed by...
pqrc96
Offline Send Email 		May 29, 2009
9:21 am

Hi, You are welcome to do whatever you want of course, but I don’t think this is what was suggested or recommended and I don’t think you should in any way ...
Tex Texin
textexin
Offline Send Email 		May 29, 2009
9:46 am

I agree with Tex's remarks. But I would add the following three points: *Dates don't have time zones. Only times or "date and time" representations have time...
johnmsteele
Offline Send Email 		May 29, 2009
11:39 am

John Good comments. I am surprised by your comment on dates. Dates definitely do have time zones. Since time zones span 25 hours, without mention of the zone, ...
Tex Texin
textexin
Offline Send Email 		May 29, 2009
11:54 am

... Personally, I think that would be fairly silly....
piebaldconsult
Offline Send Email 		Jun 1, 2009
2:57 am

... That's fine if your application imposes such restrictions, but it is not what ISO 8601 requires. ISO 8601 fixes some notations but it does not constrain...
Deckers, Michael
michael.deckers
Offline Send Email 		Jun 4, 2009
6:50 pm

... True, so we may never know the offset, but that doesn't interfere with using ISO 8601. You can simply indicate "local time" by not specifying the offset....
piebaldconsult
Offline Send Email 		May 26, 2009
2:03 pm

No....
piebaldconsult
Offline Send Email 		Apr 4, 2009
3:44 pm

Tex,   I agree with the dilemma you pose.  In reality, that means date alone often does not suffice and you must consider time of day as well.   However, in...
John Steele
johnmsteele
Offline Send Email 		May 29, 2009
12:56 pm

When I mentioned in an earlier post that I would reject certain date-times in the ISO 8601 format, I meant that I would halt processing or flag them for...
G Ashton
pqrc96
Offline Send Email 		May 29, 2009
5:33 pm
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