4.4. Datetime Standards

4.4.1. Rationale

  • Date and time formats varies from country to country 1

4.4.2. Date

Formal date format in USA 8:

4/12/61
April 12, 1961

Formal date format in Japan 7:

20/12/31

Formal date format in Germany:

12.04.1961

Date format in Poland:

12.4.1961
12.04.1961

12 IV 1961
12.IV.1961

12/4/1961
12/04/1961

12 kwietnia 1961
12 kwiecień 1961

Which format is a formal standard in Poland? 6

4.4.3. Time

24 and 12 hour clock:

  • What AM stands for?

  • What PM stands for?

5:00 AM
5:00 PM
5:00
17:00

Zero padded:

2:53
02:53
02:53:0
02:53:00

Noon and Midnight

  • Which time is a midnight?

  • Which time is a noon?

  • Confusion at noon and midnight 2

  • Is 12:00 a noon (in 24h format), or someone just simply forgot to put AM/PM?

12:00 am
12:00 pm

12:00
24:00

00:00
0:00

4.4.4. Times after 24:00

  • Times after 24:00 3

23:59:59
23:59:60
25:00
27:45
14:00-30:00

4.4.5. Military time

  • Military time 4

  • Military time zones 5

1200J
1200Z

4.4.6. References

1

https://en.wikipedia.org/wiki/Date_format_by_country

2

https://en.wikipedia.org/wiki/12-hour_clock#Confusion_at_noon_and_midnight

3

https://en.wikipedia.org/wiki/24-hour_clock#Times_after_24:00

4

https://en.wikipedia.org/wiki/24-hour_clock#Military_time

5

https://en.wikipedia.org/wiki/List_of_military_time_zones

6

https://en.wikipedia.org/wiki/ISO_8601

7

Date and time notation in Japan. Wikipedia. Year: 2019. Retrieved: 2019-06-27. URL: https://en.wikipedia.org/wiki/Date_and_time_notation_in_Japan#Date

8

Date and time notation in the United States. Wikipedia. Year: 2019. Retrieved: 2019-06-27. URL: https://en.wikipedia.org/wiki/Date_and_time_notation_in_the_United_States