Day of the week

In most calendar systems and languages, the days of the week, have individual names assigned to them. They can also have ordinal numbers, either starting at 0 or 1, although the first day of the week may differ by culture.

Especially in computer programming, day of the week is often abbreviated to ‘DOW’. This acronym is sometimes not spelt out letter by letter, but pronounced as a whole, either as /dau/ or /dou/, like Dow Jones. Likewise it may be written in minuscules ‘dow’ like a regular lexical word.

Dows further may have abbreviations or symbols.

Standard 7-day week, English, different ordinal approaches
Dow	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
Astrology	☾ Luna/Moon	♂ Mars	☿ Mercury	♃ Jupiter	♀ Venus	♄ Saturn	☼ Sol/Sun
Modern	0	1	2	3	4	5	6
Modern	1	2	3	4	5	6	7
Classic	1	2	3	4	5	6	0
Classic	2	3	4	5	6	7	1
Flexible	1	2	3	4	5	6	0 = 7
Greek gods	Selene	Ares	Hermes	Zeus	Aphrodite	Kronos	Helios
Roman gods	Diana	Mars	Mercury	Jupiter	Venus	Saturn	Apollo
Norse gods	Máni	Tiw/Týr	Woden/Óðinn	Thor/Þunor	Frigg	—	Sunna/Sól

DOM[]

Inspired by DOW, there is also an acronym ‘DOM’ for the day of the month, usually running from 1 through 28 to 31.

DOY[]

Inspired by DOW, there is also an acronym ‘DOY’ for the day of the year, usually running from 1 through 365 or to 366 in leap years in solar calendars.

WOM[]

By extension, ‘WOM’ for the week of the month may be used, usually running from 1 through 4 or 5.

WOY[]

By extension, ‘WOY’ for the week of the year may be used for the calendar week, usually running from 1 through 52, sometimes 53 (i.e. a leap week), especially if it needs to be distinguished from the week of the month or season.

MOY[]

Furthermore, ‘MOY’ for the month of the year, i.e. 1 through 12 or 13, may be useful if a calendar also recognizes months of the semester, season, quarter, trimester, quadmester or some other term.

SOY[]

The season of the year or ‘SOY’ is rarely needed because seasons are almost always direct subdivisions of the year.