. A calendar year is from january 1 to december 31; The period of time from january 1st to december 31st of the same year 也就是说，指的是一个历年，从1月1日起到当年12月1日。 校方所说的one calendar year.

A calendar year is a period of twelve months from january 1 to december 31. 例句： 1、performance is in calendar year returns.