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The Chinese Lunar Calendar is the cycle of Moon. The new moon date is the first day of a lunar month. The cycle of the Moon is shorter than the cycle of the Sun. The cycle of the Moon is about 29.53 days. One year has about 365.2425 days. Thus, one year has about 12.3685 lunar months. In order to match solar calendar, then Chinese Lunar calendar needs to add Intercalary Month (Leap Month ) into the calendar cycle. It needs 7 lunar leap months in 19 solar years.
Since the Lunar Leap Month involves the cycle of Sun, the Chinese Lunar Calendar actually is the combination of Moon and Sun calendar. How to determine the Leap Months is very complicate. The detail is in the Theory of the Chinese Lunar Calendar page.
The following tool will list out the Lunar Months by giving a solar year. It will include the Leap Month, if it is there in the given year.
From the theory of Chinese Lunar Calendar, we know that the different time zones might have different leap month assignments. Also, astronomical calendar and civil calendar have different lunar month patterns. The astronomical calendar has more accurate Moon and Sun time. But current Chinese Farmer's Almanac and official Chinese Lunar Calendar uses the Chinese Civil Calendar. Therefore, the China time zone has option to use the Civil Calendar.