Question 1

How many days does January 1901 have?

Accepted Answer

January 1901 has 31 days. It starts on Tuesday and ends on Thursday.

Question 2

What ISO week does January 1901 start in?

Accepted Answer

1 January 1901 falls in ISO week 1. Weeks run Monday–Sunday per ISO 8601.

Question 3

Where can I see the public holidays of Singapore in January 1901?

Accepted Answer

The calendar on this page marks every national public holiday of Singapore in January 1901 in red, with joint/regional days in amber.