Is it christmas?
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TaylorLiang (538)

This website tells you if its Christmas. Its accurate: 96.7741935% of the time!
EDIT: @joshwood pointed out its 99.726027398% accurate
EDIT 2: @joshwood pointed out again its: 99.726214921% accurate!
EDIt 3: Thanks to (once again) @joshwood, theres a file for how accurate it is!
EDIT 4: @EthanCulp changed it again. Check file.

edit 5: no change

edit 6: will give cycles for more decimals
edit 8: @DJWang gave more decimals

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joshwood (115)

Actually, if you take leap years into account it's even more accurate.
1 - ( 4 / (365 * 4 + 1) ) = 0.99726214921

99.726214921% accurate, to be exact!