Remember the Number of Days per Month

 Never forget the number of days in the month, using the following memory method or 'mnemonic'. The calendar authors got hungover in August, and bumped the rest of the calendar by 1 month (in terms of days per month).

Month	Abbreviation	Month       Numerical	Month No. of days	Johnny Mnemonic	Qtr	Season
January	Jan.	1	31	odd month	Q1	Winter
February	Feb.	2	28  (common year) 29  (leap year/4)	Jan-3 (even month - 2)	Q1	Winter
March	Mar.	3	31	odd month	Q1	Spring
April	Apr.	4	30	even month	Q2	Spring
May	May.	5	31	odd	Q2	Spring
June	Jun.	6	30	even	Q2	Summer
July	Jul.	7	31	odd	Q3	Summer
August	Aug.	8	31	summer vacation / hangover	Q3	Summer
September	Sep.	9	30	bumped	Q3	Autumn
October	Oct.	10	31	bump-odd now	Q4	Autumn
November	Nov.	11	30	bump-even now	Q4	Autumn
December	Dec.	12	31	bump-odd now	Q4	Winter

Historically, August was named by Gaius Julius Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14. Another way to remember this...

• Augustus was born in 63 B.C. and named Gaius Octavius (Octavian) and was the grandson of Julius Caesar's sister.
• In addition to changing Sextilis to Augustus, speculation states that he took one day from February and one from September to add to his month, making it 31 days; because he apparently did not wish to have August with fewer days than Julius (July).

The calendar commonly used in modern America is the Gregorian calendar. It was introduced by Pope Gregory XIII in 1582 and is a modification of the Julian calendar. The Gregorian calendar is widely used worldwide and is the calendar system officially followed by most countries, including the United States.

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By Tgru001 - Own work, CC BY-SA 4.0, Link to SVG Artwork on Wikipedia