Abbreviations of Months of the Year, Days of the Week, and Other Abbreviations of Time

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Month Abbreviaton

What is the proper way to abbreviate the word “month”? Unfortunately, there is no only proper way. It all depends on context: mth (plural mths) is most popular.



mo. (plural mos.).

MM and M are usually used in date formats like MM/DD/YY. In some documents it is common to see just “m”.

Please note: Abbreviations used on this page denote common usage unrelated to documenting sources. When documenting sources using MLA style, the months with four or fewer letters, e.g. May, June, and July are not abbreviated, the remaining months Jan., Feb., Mar., Apr., Aug., Sept., Oct., Nov. and Dec. are abbreviated. When documenting sources using APA style, no abbreviations are used, all months should be spelled out in full. Both months and days of the week should start with capital letters and end with a period.

1.   January – Jan. 2 .  February – Feb.
3.   March – Mar. 4.   April – Apr.
5.   May – May 6.   June – Jun.
7.   July – Jul. 8.   August – Aug.
9.   September – Sep. or Sept. 10.  October – Oct.
11.  November – Nov. 12.  December – Dec.

See also:

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Seasons of the Year (Typically in North America)

spring – March, April, May
summer – June, July, August
autumn or fall – September, October, November
winter – December, January, February

See also:

  • The Seasons on Earth from Department of Astronomy, Cornell University, Ithaca, NY.
  • Earth’s Seasons. Seasons are the result of the tilt of the Earth’s axis, from Enchanted Learning.

Abbreviations of Days of the Week

1. Sunday – Sun. 2. Monday – Mon.
3. Tuesday – Tu., Tue., or Tues. 4. Wednesday – Wed.
5. Thursday – Th., Thu., Thur., or Thurs. 6. Friday – Fri.
7. Saturday – Sat.

See also:

Other Abbreviations of Time

second – sec. minute – min.
hour – hr. (sometimes h.) week – wk.
ante meridiem (before noon) – a.m. post meridiem (after noon) – p.m.
midnight – 12:00 a.m. noon – 12:00 p.m.
month – mo. year – yr.
century – cent. before Christ – BC or B.C. (e.g. 30 BC)
anno Domini (in the year of our Lord) after birth of Christ – AD or A.D.
(e.g. AD 2005)
before common era – BCE or B.C.E. (same as BC) (e.g. 30 BCE) common era – CE or C.E. (Christian Era, same as AD)
(e.g. 2005 CE)

You may write A.M. and P.M. using all capital letters or all lower case letters. However, a style you have chosen must be followed consistently throughout the entire document. You should not confuse the two styles.


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