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Some days were added to certain months, and the total number of days in the year went to 365 from 354. Every fourth year was made a leap year, with an extra day in one month. But there was still a discrepancy between the true year and the Julian calendar year.
353, 354 or 355 days A Lunar month has in average 29.53 [Lunar month - Wikipedia, the free encyclopedia]. So 12*29.53=354.36 days. In practice lunar years with 12 months will have 354 or 355 days. By rules based on religion the jewish calendar also permits years of 353 days.