The last day of the Gregorian year — celebrated worldwide with countdowns and fireworks.
This is a Gregorian calendar holiday — observed on the same date worldwide. There is no tithi or panchang significance to the date; it does not shift by timezone.
New Year's Eve, December 31, is observed worldwide with parties, countdowns to midnight, and fireworks. The Times Square ball drop in New York and the fireworks at Sydney Harbour are among the most-watched annual events globally.
Computed for Casper (America/Denver) using local sunrise, sunset and astronomical positions.
Other observances and vrats falling in December 2026, with dates computed for Casper.
A more detailed account of New Year's Eve — its mythology, regional variations, and rituals — is being prepared.