[docs] Report bugs on the leaps year

Sat Jan 12 01:14:19 EST 2019

Dear Sir/Madam,

[cid:image002.png at 01D4AA81.1B676110]

I accidentally found out that for years 1700, 1800, and 1900, they should be leaps year but then it shows that it has 28 days on February.

Best Regards,
Sheou Shuang.

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