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Days In Consecutive Months Of The Year

The calendar year starts on January 1st of each year and ends on December 31st. A Fiscal year is twelve consecutive months starting on the first day of a month. The days of the month in each year is as follows:-
January => 31
February => 28 (29)
March => 31
April => 30
May => 31
June => 30
July => 31
August => 31
September => 30
October => 31
November => 30
December => 31

Have you noticed that seven (7) months of the year have 31 days - January, March, May, July, August, October, December. These are Months 1, 3, 5, 7, 8, 10, 12. (Note the almost alternate nature!)

Only four months have 30 days - April, June, September, November. Months 4, 6, 9, 11. (Again, almost alternate!)

February has 28 days except for leap years when there are 29 days (once every 4 years).

More broadly, there are only two occasions where there are consecutive months of 31 days - December/January and July/August.

What emerges is a pattern of alternate size similarity!

Want to find the number of days in a specific consecutive group of months?

  • Select Start month.
  • Select number of months to accumulate.
  • Press the 'Calculate Number Of Days' button (when it appears !).
Days In Groups Of Months
Start Month 

Number Of Days Between Two Dates


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