The original Egyptian calendar was.But the Egyptian calendar was later modified by the Greeks/Spartan and then the Romans etc. 30 yrs after the birth of Christ, the calendar was off by 12 days.

• 最初的埃及历法是这样，但埃及历法后来被希腊人/斯巴达人改进，然后在基督诞生30年之后由罗马人改进，历法中断了12天。