What happened to flags on 12 June
2 flags in the atlas carry this date. The sentence under each one is where that is written down, in its own article.
- Luxembourg 1845
The three-coloured horizontal design was fixed on 12 June 1845.
From Flag of Luxembourg on Wikipedia, as it read on 2026-08-29
- Jersey 1979
The flag was adopted by the States of Jersey on 12 June 1979, proclaimed by Queen Elizabeth II on 10 December 1980 and first officially hoisted on 7 April 1981.
From Flag of Jersey 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.