2. 17 when is the lunar calendar?

What you want to ask is when February 17 of the solar calendar is the lunar calendar? The 27th day of the first month.

According to the calendar, February 17 of Gregorian calendar in 2023 is the 27th day of the first lunar month, and the 6th day of the first lunar month is the first lunar month.

The lunar calendar, that is, the current traditional calendar in China, belongs to the yin-yang calendar, that is, the lunar calendar and the solar calendar. According to the change cycle of the moon phases, each moon phase changes to one month, taking the tropical year of the sun as the length of a year, and adding 24 solar terms and setting leap months to make the average calendar year adapt to the tropical year. The combination of lunar calendar and solar calendar in lunar calendar forms the method of combining yin and yang. Because of the use of "Xia Zheng", it was called Li Xia in ancient times.