| Gregorian: | Monday, 27 September 2021 |
| Mayan: | Long count = 13.0.8.16.2; tzolkin = 8 Ik; haab = 0 Yax |
| French: | 6 Vendémiaire an 230 de la Révolution |
| Islamic: | 19 Safar 1443 |
| Hebrew: | 21 Tishri 5782 |
| Julian: | 14 September 2021 |
| ISO: | Day 1 of week 39 of 2021 |
| Persian: | 5 Mehr 1400 |
| Ethiopic: | 17 Maskaram 2014 |
| Coptic: | 17 Tut 1738 |
| Chinese: | Cycle 78, year 38 (Xin-Chou), month 8 (Ding-You), day 21 (Wu-Yin) |
| Julian day: | 2459485 |
| Day of year: | Day 270 of 2021; 95 days remaining in the year |
| Discordian: | Setting Orange, Bureaucracy 51, Year of Our Lady of Discord 3187 |
