A lunar month is about 28 days. if the moon were closer to earth than it is now, the lunar month would be less than 28 days.
Lunar calendars are based on the phases of the moon as seen from the earth. One lunar month is the time of one lunar cycle which is nearly 29.5 days. A lunar-year calendar is to be kept in step with the seasonal year, a periodic intercalation (addition) of days is necessary.
It allows for a leap year by following the Metonic cycle with an intercalary month in 7 years out of 19. It makes no effort to keep calendric and seasonal years together.
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