What happened to flags on 31 December
3 flags in the atlas carry this date. The sentence under each one is where that is written down, in its own article.
- Bosnia and Herzegovina 1946
Belgrade officials listened to the public opinion but proceeded to add the federal Yugoslav tricolour to the canton of a plain red flag to symbolise the republic's affiliation to the Federation, and as such, it was officially adopted on 31 December 1946.
From Flag of Bosnia and Herzegovina on Wikipedia, as it read on 2026-08-29
- North Macedonia 1946
This flag was adopted on 31 December 1946 under Article 4 of the Constitution of the People's Republic of Macedonia.
From Flag of North Macedonia on Wikipedia, as it read on 2026-08-29
- Rwanda 2001
It was adopted on 31 December 2001.
From Flag of Rwanda on Wikipedia, as it read on 2026-08-26
How a day gets onto this site
A flag is here because a sentence in its own English Wikipedia article puts it on this date, and that sentence is printed above. Nothing was worked out from a year, and nothing was written for the occasion. Every sentence names the article it came from and the version of that article it was read in, so you can go and check it.
The calendar is still short rather than full. A third of the year has no page here, because a flag only gets a day when a sentence in its article puts something on one, and plenty of articles never do. Nothing is invented to fill the gap.