How many days are in January?

Q: How many days are in January?

31 days. January 2026 runs from Thursday, January 1, 2026 to Saturday, January 31, 2026: 31 days in all, 22 of them weekdays and 9 weekend days. 2 federal holidays fall inside it — New Year's Day (January 1, 2026), Martin Luther King Jr. Day (January 19, 2026) — so 20 working days are left once those are taken off. Both end days are counted, which is how a calendar counts a month rather than how a date difference counts one. Business days here are Monday to Friday; federal holidays are listed separately because private employers do not all take the same ones.

January 2026 has

31 days

Counted from Thursday, September 10, 2026. The figures are for January 2026; the table below carries them forward.

Days: 31
Weekdays: 22
Weekend days: 9
That is: 4 weeks and 3 days

January 2026 runs from Thursday, January 1, 2026 to Saturday, January 31, 2026: 31 days in all, 22 of them weekdays and 9 weekend days. 2 federal holidays fall inside it — New Year's Day (January 1, 2026), Martin Luther King Jr. Day (January 19, 2026) — so 20 working days are left once those are taken off. Both end days are counted, which is how a calendar counts a month rather than how a date difference counts one. Business days here are Monday to Friday; federal holidays are listed separately because private employers do not all take the same ones.

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Result

31 days

Days: 31
Weeks and days: 4 weeks, 3 days
Months and days: 0 months, 30 days
Business days (Mon–Fri): 22Weekdays only; public holidays are not excluded.
Weekend days: 9
Resulting date: —
Day of the week: Thursday → Saturday

Assumptions

Dates are local calendar dates; times and time zones are ignored.
Business days are Monday–Friday with no holiday exclusions.
Adding months keeps the day of month, clamped to the target month's length.

Common deadlines from January 1, 2026

After	Date	Falls on a
7 days	January 8, 2026	Thursday
14 days	January 15, 2026	Thursday
21 days	January 22, 2026	Thursday
30 days	January 31, 2026	Saturday
45 days	February 15, 2026	Sunday
60 days	March 2, 2026	Monday
90 days	April 1, 2026	Wednesday
120 days	May 1, 2026	Friday
180 days	June 30, 2026	Tuesday
365 days	January 1, 2027	Friday

Calendar days counted from the start date, the day itself not counted. Deadlines written as 'within 90 days' are calendar days unless the contract or court rule says business days.

January in the next five years

Year	Days	Business days
January 2026	31 days	22 weekdays, 20 working
January 2027	31 days	21 weekdays, 19 working
January 2028	31 days	21 weekdays, 20 working
January 2029	31 days	23 weekdays, 21 working
January 2030	31 days	23 weekdays, 21 working

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