199 1 What day is the first day of the first lunar month?

February 24th in the Gregorian calendar.

According to the old calendar, 199 1 lunar calendar is February 24th.

Lunar calendar is the current modern calendar in China, which belongs to the combined calendar of yin and yang, that is, the combined calendar of lunar calendar and solar calendar. According to the change cycle of the moon phase, each moon phase changes to one month, and the reference solar year is the length of one year, 24 solar terms are added, and leap months are set to make the average calendar year adapt to the tropic year.