What happened to flags on 29 September
3 flags in the atlas carry this date. The sentence under each one is where that is written down, in its own article.
- Costa Rica 1848
The flag was officially adopted on 29 September 1848, with the only modifications since then being to the placement and design of the entrenched coat of arms on the state flag.
From Flag of Costa Rica on Wikipedia, as it read on 2026-08-26
- Falkland Islands 1948
On 29 September 1948, the flag was updated to include the new coat-of-arms (a ram above the Desire on shield with the motto below) superimposed upon a white disc.
From Flag of the Falkland Islands on Wikipedia, as it read on 2026-08-26
- Brunei 1959
After the constitution was proclaimed on 29 September 1959, the national emblem was added.
From Flag of Brunei 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.