October 21
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| Su | Mo | Tu | We | Th | Fr | Sa |
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| 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| 26 | 27 | 28 | 29 | 30 | 31 | |
| 2025 | ||||||
| October 21 in recent years |
| 2024 (Monday) |
| 2023 (Saturday) |
| 2022 (Friday) |
| 2021 (Thursday) |
| 2020 (Wednesday) |
| 2019 (Monday) |
| 2018 (Sunday) |
| 2017 (Saturday) |
| 2016 (Friday) |
| 2015 (Wednesday) |
October 21 is the 294th day of the year (295th in leap years) in the Gregorian calendar; 71 days remain until the end of the year.