| Gregorian: | Tuesday, 18 May 2021 |
| Mayan: | Long count = 13.0.8.9.10; tzolkin = 6 Oc; haab = 8 Zip |
| French: | 29 Floréal an 229 de la Révolution |
| Islamic: | 6 Shawwal 1442 |
| Hebrew: | 7 Sivan 5781 |
| Julian: | 5 May 2021 |
| ISO: | Day 2 of week 20 of 2021 |
| Persian: | 28 Ordibehest 1400 |
| Ethiopic: | 10 Genbot 2013 |
| Coptic: | 10 Bashans 1737 |
| Chinese: | Cycle 78, year 38 (Xin-Chou), month 4 (Gui-Si), day 7 (Bing-Yin) |
| Julian day: | 2459353 |
| Day of year: | Day 138 of 2021; 227 days remaining in the year |
| Discordian: | Pungenday, Discord 65, Year of Our Lady of Discord 3187 |
