404 Day has always been observed annually on April 4.
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When is 404 Day?
- 404 Day 2017 is observed on Tuesday, April 4, 2017
- 404 Day 2018 is observed on Wednesday, April 4, 2018
- 404 Day 2019 is observed on Thursday, April 4, 2019
- 404 Day 2020 is observed on Saturday, April 4, 2020
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