Prior to adoption of the Western solar calendar system, China exclusively followed a lunar calendar in determining the times of planting, harvesting, and festival occasions. Though today people in China use the western calendar for most practical matters of daily life, the old system still serves as the basis for determining numerous seasonal holidays. This coexistence of two calendar systems has long been accepted by the people of China.
First, determine the dates for the new moons. Here, a new moon is the completely black moon (that is, when the moon is in conjunction with the sun), not the first visible crescent used in the Islamic and Hebrew calendars. The date of a new moon is the first day of a new month.