How many days are there in a year?

A year has 365 or 366 days in the solar calendar and 354 or 355 days in the lunar calendar.

A year is a calendar unit with four solar terms: spring, summer, autumn and winter. Spring is the beginning and end of a year. A year is about 12 months, excluding leap years, solar calendar 365 or 366, lunar calendar 354 or 355 days.