Why can China perpetual calendar software know the birthday?

The reasons why China calendar software can know the birthday date are: lunar calendar calculation and solar terms calculation.

1. Lunar calendar calculation: On the basis of lunar calendar calculation, China calendar software can calculate the corresponding lunar calendar date according to the Gregorian calendar date entered by users. Because there are many festivals and anniversaries related to the lunar calendar in China traditional culture, it is convenient for users to find and record the relevant dates through lunar calendar calculation.

2. Calculation of solar terms: China calendar software can also calculate the dates of 24 solar terms every year. As many festivals and activities in China traditional culture are related to solar terms, users can know the date of solar terms through China calendar software, and better understand and experience China culture.