Is the birthday on the ID card a new calendar or an old calendar?

Is the birthday on the ID card a new calendar or an old calendar?

It depends on the information registered by parents (now the new calendar date on the birth medical certificate issued by the hospital is generally used, and some areas or some dates may be filled in manually by the parties).

Lunar calendar, namely lunar calendar, old calendar, yellow calendar and China traditional calendar.

Gregorian calendar, namely solar calendar, new calendar, national calendar and international calendar.