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Only one month has 28 days, and it's the same month that has 29 days, and that's every four years, so it's not some months.
on March 28, 2016
on December 04, 2012
... i don't know the answer to your actual question, but i think you should know that there has NEVER been a year where 1 month had 28 days and another has 29 days. February gains one day every 4 years because 1 revolution around the Sun takes 365 1/4 days, so in 4 years, we are missing 1 day, and it is placed in February... That's all i know. Hope I helped
on November 20, 2012