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The first half of the year, months have 31:30 days, the second half they have 30:31 days.

31:30 mirrored pattern
Month Days
01 January 31
02 February 30
03 March 31
04 April 30
05 May 31
06 June 30
07 July 30
08 August 31
09 September 30
10 October 31
11 November 30
12 December 31

Most calendar reform proposals put the leap item at the end of the year, accordingly the twelfth month would have 31 days only in leap years, 30 days otherwise.

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