Winter 2025 Date Calculator. Winter 2025 starts on sunday, december 21st in the northern hemisphere, with the first day of winter being the shortest daylight day of the year with the earth's axis having reached its furthest tilt away from the sun and. This online date calculator will help you calculate how many days are left until a given date.

There are one day remaining until the beginning of winter, which is marked by the winter solstice and falls on december 21, 2024. Both can deal with business days and holidays.