What happened to flags on 21 October
4 flags in the atlas carry this date. The sentence under each one is where that is written down, in its own article.
- Madagascar 1958
Upon the adoption of the flag on 21 October 1958, Barinia Tsara of the Bureau of the Constituent National Assembly gave the following significance to its colours:
From Flag of Madagascar on Wikipedia, as it read on 2026-08-26
- Costa Rica 1964
However, the coat of arms that appears on the flag used by the government was altered slightly in 1906 and 1934 and, most recently, on 21 October 1964.
From Flag of Costa Rica on Wikipedia, as it read on 2026-08-26
- Estonia 1987
21 October 1987 was the first time when Soviet forces did not take down the flag at a public event.
From Flag of Estonia on Wikipedia, as it read on 2026-08-29
- Myanmar 2010
The current flag was adopted on 21 October 2010.
From Flag of Myanmar on Wikipedia, as it read on 2026-08-29
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.