The leap years
It’s also called intercalary (闰年 in Chinese) when February has 29 days. According to this website, 1600 and 2000 have 29th day but 1700, 1800 and 1900 have not. This website explains:
A normal year is defined as 365 days. … Putting all of these rules together, you can see that a year is a leap year not only if it is divisible by 4 — it also has to be divisible by 400 if it is a centurial year. So 1700, 1800 and 1900 were not leap years, but 2000 was.
And here is the Quora discussion. But I just looked up on iPhone’s calendar, Apple seems to disagree: the February of 1700, 1800, 1900 (of course 2000 too) all have the 29th day!
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