How Many Days Until the Winter Solstice 2028?

the Winter Solstice 2028 is Thursday, 21 December 2028

There are 855 days between 19 August 2026 and the Winter Solstice 2028, which falls on Thursday, 21 December 2028. That is 122 weeks and 1 day, or 585 working days once Saturdays, Sundays and the US federal holidays in between are taken out — the figure that matters if you are counting delivery lead time or a work schedule rather than sleeps. The date is 2028-12-21 in ISO form and 12/21/2028 in the US format, it falls in ISO week 51 of 2028, and it is day 356 of 366.

How the date of the Winter Solstice is decided

The December solstice, the shortest day in the northern hemisphere, falling on 21 or 22 December.

That makes it a computed date: there is no fixed day and no simple weekday rule, so it has to be worked out from a formula or a calendar of its own each year. In 2028 it works out as Thursday 21 December.

the Winter Solstice is an observance rather than a federal holiday. Offices, banks and schools stay open unless an individual employer chooses otherwise, and it counts as an ordinary business day in every calculator here. Only the eleven federal holidays are treated as non-working days — the list and the reasoning are on the holiday sources page.

the Winter Solstice in the years after 2028

Both the date and the weekday move, because the rule is not tied to either.

Every convention used above — whether the start date counts, how month ends are clamped, which holidays close an office — is written out on the methodology page, including how we count the 585 working days above.