| Millennium: | 3rd Millennium |
|---|---|
| Centuries: | 20th cent. – 21st cent. – 22nd cent. |
| Decades: | 1990s 2000s 2010s – 2020s – 2030s 2040s 2050s |
| Years: | 2018 2019 2020 – 2021 – 2022 2023 2024 |
| Gregorian calendar | 2021 MMXXI |
| Ab urbe condita | 2774 |
| Armenian calendar | 1470 ԹՎ ՌՆՀ |
| Assyrian calendar | 6771 |
| Bahá'í calendar | 177–178 |
| Bengali calendar | 1428 |
| Berber calendar | 2971 |
| British Regnal year | 69 Eliz. 2 – 70 Eliz. 2 |
| Buddhist calendar | 2565 |
| Burmese calendar | 1383 |
| Byzantine calendar | 7529–7530 |
| Chinese calendar | 庚子年 (Metal Rat) 4717 or 4657 — to — 辛丑年 (Metal Ox) 4718 or 4658 |
| Coptic calendar | 1737–1738 |
| Discordian calendar | 3187 |
| Ethiopian calendar | 2013–2014 |
| Hebrew calendar | 5781–5782 |
| Hindu calendars | |
| - Vikram Samvat | 2077–2078 |
| - Shaka Samvat | 1942–1943 |
| - Kali Yuga | 5121–5122 |
| Holocene calendar | 12021 |
| Igbo calendar | 1021–1022 |
| Iranian calendar | 1399–1400 |
| Islamic calendar | 1442–1443 |
| Japanese calendar | Heisei 33 (平成３３年) |
| Javanese calendar | 1954–1955 |
| Juche calendar | 110 |
| Julian calendar | Gregorian minus 13 days |
| Korean calendar | 4354 |
| Minguo calendar | ROC 110 民國110年 |
| Nanakshahi calendar | 553 |
| Thai solar calendar | 2564 |
| Unix time | 1609459200–1640995199 |
The year AD 2021
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