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The day you are looking for is 500 Days ago,

but, tomorrow, it is still 500 Days ago,

and two days ago, it was still 500 Days ago.

That Day was happy for some, but for some it wasn't.

When am I?

Note: You do not need to involve the date and time this puzzle was posted.

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up vote 4 down vote accepted

Could it be

June 6, 1944, sometimes known as D-Day, D being the Roman numeral for 500?

I'm not sure you could say it was happy for some, though it certainly contributed to an Allied victory, which itself was very happy for many.

The Nazis definitely did a big frowny face because of D-Day, that's for sure.

The event will always have occurred on that specific date - calling it "500 Day[s ago]" is just a wordplay trick.

The only part that doesn't quite work is the word "ago", as substituting "D" in for "500" doesn't make the sentence make any grammatical sense.

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That was the intended solution. – wythagoras Jan 28 at 21:07
@wythagoras Thank you! I'm just very self-conscious about answers I'm not 100% sure of. – question_asker Jan 28 at 21:08

I believe the answer is

July 17, 2009


July 17, 2009 was the release date of the movie 500 Days of Summer. The title of the movie remains "500 Days of Summer" regardless of what day it currently is; while the events of the movie were happy for the character Summer (the main female character/romantic interest), they weren't happy for the character Tom (the male protagonist).

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Not the answer, but it is reasonable. – wythagoras Jan 28 at 20:43
For my first answer on Puzzling.SE, I'm happy with "reasonable". – DylanSp Jan 28 at 20:50

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