The format used for the date also varies based on where you live, whether you are in the military and whether you want to show a formal or informal date. For example, in the United States, the month is listed first in the date while in Britain the day's date is listed before the month.
In this World War II letter, the writer lists where they are in Germany (Rudersdorf, deu) and the date shown as day.month.year (9.3.41).
There is no "right" or "wrong" format. The more formal formats include words (such as Tuesday, January 1, 2019) and the more informal format tend to use only numbers (such as 1/1/19).
These inconsistencies are growing more confusing with the growth of international travel, trade and internet communication.
The international format was defined by ISO, the International Organization for Standardization in their document ISO 8601:2004. This document was created in 2004 to address the inconsistencies in how the date is expressed throughout the world.
ISO 8601:2004 expresses the calendar date using the year, month and day of the month - in that order. Specifically the ISO date format is YYYY-MM-DD:
For example, "2nd of January 2019" in this ISO format would be written as 2019-01-02.
This ISO document does not solve all international confusion. For example, how does a native German speaker interpret 04/10/09 on a screen they are reading in U.S. English on a German website.
The military date format includes a reference to time of day in addition to the month, day's date and the year. The time of day is expressed in Zulu time which is international time, not based on time zones.
As an example, in military messages or on maps showing ship and troop movements, the format is DDHHMMZ YY. As an example, "021545Z JAN 19" would represent 15:45 Zulu time on Wednesday the 2nd of January, 2019.
The name of month is not capitalized in Spanish. For example, "de enero" is used to say "of January."
The date formats used in APA and MLA are very different:
For more examples, check out the article and infographic on "How to Write a Bibliography" on YourDictionary.
For example, the year 2019 would be written as MMXIX in Roman numerals. Interestingly, the ancient Romans notated it quite differently in the form of MMXVIIII.
For more information on writing Roman numerals, check out the article "Roman Numerals" on YourDictionary.