Is the lunar calendar or the solar calendar?

The Gregorian calendar is the Gregorian calendar (that is, the calendar that calculates time according to the revolution of the earth), which is what we usually call 1 month 1 day (New Year's Day), May 4 and other dates. In addition, our 24 solar terms are also determined according to the earth's revolution, so every year Tomb-Sweeping Day falls on April 4th or 5th, and the summer solstice and winter solstice are solar terms.

The lunar calendar is a calendar that calculates time according to the phase of the moon, that is, the first day of the first month (Spring Festival), the ninth day of September (Double Ninth Festival), the eighth day of the twelfth month (Laba Festival) and so on.