| Gregorian: | Friday, 1 January 2010 |
| Mayan: | Long count = 12.19.16.17.15; tzolkin = 11 Men; haab = 13 Kankin |
| French: | 12 Nivôse an 218 de la Révolution |
| Islamic: | 15 Muharram 1431 |
| Hebrew: | 15 Teveth 5770 |
| Julian: | 19 December 2009 |
| ISO: | Day 5 of week 53 of 2009 |
| Persian: | 11 Dey 1388 |
| Ethiopic: | 23 Takhsas 2002 |
| Coptic: | 23 Kiyahk 1726 |
| Chinese: | Cycle 78, year 26 (Ji-Chou), month 11 (Bing-Zi), day 17 (Xin-Hai) |
| Julian day: | 2455198 |
| Day of year: | Day 1 of 2010; 364 days remaining in the year |
| Discordian: | Sweetmorn, Chaos 1, Year of Our Lady of Discord 3176 |
