Jimao Yue Ji

It's the first month when the sky is dry and the second year is not ripe, and the period of waking up to Qingming is:

……

1975 fluctuated in March and cleared up in April.

1980 fluctuated in March and cleared up in April.

1985 fluctuated in March and cleared up in April.

1990 fluctuated in March and cleared up in April.

1995 fluctuated in March and cleared up in April.

From March 2000 to April 2000, obviously.

From March 2005 to April 2005, obviously.

……

Calendars are not commonly used, but calendars are mostly used for numerology. Therefore, it is based on the solar term month, not the new moon, which is different from the Gregorian calendar year based on the lunar year.