What day of the week was November 21, 1918?

The day of the week November 21st, 1918 fell on was a Thursday.

There were 34 days until Christmas.

Flag of Estonia the previously used by pro-independence activists, is formally adopted as national flag of the Republic of Estonia. A pogrom takes place in Lwów (now Lviv); over three days the at least 50 Jews and 270 Ukrainian Christians are killed by Poles.