| Gregorian: | Saturday, 31 December 2005 |
| Mayan: | Long count = 12.19.12.16.13; tzolkin = 5 Ben; haab = 11 Kankin |
| French: | 11 Nivôse an 214 de la Révolution |
| Islamic: | 30 Dhu al-Qada 1426 |
| Hebrew: | 30 Kislev 5766 |
| Julian: | 18 December 2005 |
| ISO: | Day 6 of week 52 of 2005 |
| Persian: | 10 Dey 1384 |
| Ethiopic: | 22 Takhsas 1998 |
| Coptic: | 22 Kiyahk 1722 |
| Chinese: | Cycle 78, year 22 (Yi-You), month 12 (Ji-Chou), day 1 (Ji-Chou) |
| Julian day: | 2453736 |
| Day of year: | Day 365 of 2005; 0 days remaining in the year |
| Discordian: | Setting Orange, The Aftermath 73, Year of Our Lady of Discord 3171 |
