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Interesting date math coincidence I've seen on the net:

WWI started 1914-07-28 : 19 + 14 + 7 +28 = 68
WWII started 1939-09-01 : 19 + 39 + 9 + 1 = 68
Ukraine invasion started 2022-02-24: 20 + 22 + 2 + 24 = 68.

Through a simple script we can find that over 1900-2100 there's 730 such dates:

for day=1,365.25*200 do
local time = os.time{year=1900, month=1, day=day}
local d = os.date('*t', time)
if d.year//100 + d.year%100 + d.month + d.day == 68 then
print(os.date('%Y-%m-%d', time))
end
end

Joining these dates back to Wikipedia for "interesting events" is left as an exercise to the reader (as is reimplementing in other languages).

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