March 31
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| March 31 in recent years |
| 2025 (Monday) |
| 2024 (Sunday) |
| 2023 (Friday) |
| 2022 (Thursday) |
| 2021 (Wednesday) |
| 2020 (Tuesday) |
| 2019 (Sunday) |
| 2018 (Saturday) |
| 2017 (Friday) |
| 2016 (Thursday) |
March 31 is the 90th day of the year (91st in leap years) in the Gregorian calendar; 275 days remain until the end of the year.