Talk:Date format

From Rosetta Code

Input[edit]

I'm not exactly sure what is supposed to go on here. How is the date given? How would you like it formatted? I can give you POSIX time pretty easily in most languages...but I don't think you want that. --mwn3d 23:54, 10 November, 2007 (EST)

The Forth and Perl examples, as written, print the current date and time. Seems like a good choice. --Short Circuit 15:02, 10 February 2008 (MST)
The page has been tagged as "This task has been clarified". But it has not been clarified. It still does not say how the date is given. I agree that current date would be a good choice, that should be added to the task description. --PauliKL 09:39, 3 October 2008 (UTC)
If any output format is to be chosen then that should be one of ISO 8601, I suppose. --Dmitry-kazakov 12:54, 3 October 2008 (UTC)
ISO sounds like a great idea. If we want to make things the same across all languages, why not use a standard, right? Also, I think the current date should be used. It's the easiest to specify. --Mwn3d 14:19, 3 October 2008 (UTC)

Leading zeros[edit]

While I'm sure that there should be no leading zeros in the format where words occur, I suspect that the intention is for Febrary 1st, 2008 to be formatted "2008-02-01" not "2008-2-1". Does the specification need to be altered to reflect this? --TBH 22:17, 8 February 2008 (MST)

ISO 8601 requires leading zeros, but the task is still not clarified. Personally I think that it mangles two separate issues:
  • splitting a time stamp into fields, like month number, day of week etc in presence of a given time zone
  • formatted output of the fields
Does it really matter if the output should be 01:02:2008, 2008/01/02, 1/II/2008 etc? --Dmitry-kazakov 12:54, 3 October 2008 (UTC)
Of course the format of date matters. What use would there be for a date if people do not understand what it means? (For example, which number is the month and which one is the day.) This is actually a real problem in the real world. If it is not possible to use the local date format, at least you should format the date correctly so that people will know which format you are using. There are three commonly used formats:
  • American: mm/dd/yyyy
  • European: dd.mm.yyyy
  • ISO: yyyy-mm-dd
Note that each format uses different separator. You should always use correct separator for each format so that people will know which format is used.
Here in Rosetta Code, the main thing is that all the implementations implement the same task. Therefore all the implementations should use the same format.
--PauliKL 12:00, 5 October 2008 (UTC)
Separators does not identify the format, unless it is a standard requirement (like the case of ISO). I commonly use /, both in writing the date "european"-way and year/month/day (can't call this the ISO-way if ISO requires -) --ShinTakezou 18:11, 13 May 2009 (UTC)
Separators do not reliably identify the format just because some people do it wrong! That is why it is important to tell people to do it right. --PauliKL 15:05, 15 May 2009 (UTC)
"American" and "European" do not identify a standard but an "habit", so there can't exist people doing wrong or right: it's just common use; and standards matter only when they matter, i.e. in the context requires them. I won't comply to any standard or "common habit" when writing, unless it's an official document requiring compliance to a specific format. --ShinTakezou 17:20, 16 May 2009 (UTC)
"Be strict in what you generate, liberal in what you accept." (From unknown) --Short Circuit 22:17, 15 May 2009 (UTC)
Postel's Law. The further discussion there is worth reading. --Kevin Reid 19:00, 16 May 2009 (UTC)