Question: Do the cosmic gods and goddesses have birthdays?

Sri Chinmoy: They do, but they celebrate their birthday as the day when the happiest thing has happened. When they conquer hostile forces on earth or in Heaven, then they celebrate their victory.

From:Sri Chinmoy,The soul's special promise, part 1, Agni Press, 1994
Sourced from https://srichinmoylibrary.com/ssp_1