What happened to flags on 30 September
2 flags in the atlas carry this date. The sentence under each one is where that is written down, in its own article.
- Botswana 1966
The new flag was first hoisted at midnight on 30 September 1966, the day Botswana gained independence.
From Flag of Botswana on Wikipedia, as it read on 2026-08-26
- Thailand 2017
The colours of the flag were standardised in an announcement of the Office of the Prime Minister dated 30 September 2017, on the occasion of the 100th anniversary of its adoption.
From Flag of Thailand 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.