There are 90 days between 1 January 2027 and 31 March 2027 — 64 weekdays, 26 weekend days and 61 business days (weekdays minus US federal holidays). The range covers 3 months, from Friday, 1 January 2027 (Friday) to Wednesday, 31 March 2027 (Wednesday). This page gives the exact count, the month-by-month breakdown, and how the count is worked out.

Try the tool: Days Between Dates Calculator — count the days, weeks and months between any two dates.

Try the tool: Business Days Calculator — count the business days in this range, with your own holidays added.

The count

Count Value
Total days (1 January to 31 March 2027, inclusive) 90
Weekdays (Monday–Friday) 64
Weekend days 26
Business days (weekdays minus federal holidays) 61
Full weeks 12 (plus 6 days)

The count is inclusive: it counts both the first day (1 January) and the last day (31 March). The days between dates calculator uses the standard convention of counting the days you add to the start date to reach the end date, which for this range gives 89 days — one less than the inclusive count, because the start day itself is not counted. Both conventions are correct; they answer slightly different questions, and the difference is always exactly one day.

Month-by-month breakdown

Month Days Weekdays Weekends Business days
January 2027 31 21 10 19
February 2027 28 20 8 19
March 2027 31 23 8 23
Total 90 64 26 61

Working weeks in the range

Every working week in the range, with its business days:

Week starting Days Business days
28 December 2026 1 January 2027 – 3 January 2027 0
4 January 2027 4 January 2027 – 10 January 2027 5
11 January 2027 11 January 2027 – 17 January 2027 5
18 January 2027 18 January 2027 – 24 January 2027 4
25 January 2027 25 January 2027 – 31 January 2027 5
1 February 2027 1 February 2027 – 7 February 2027 5
8 February 2027 8 February 2027 – 14 February 2027 5
15 February 2027 15 February 2027 – 21 February 2027 4
22 February 2027 22 February 2027 – 28 February 2027 5
1 March 2027 1 March 2027 – 7 March 2027 5
8 March 2027 8 March 2027 – 14 March 2027 5
15 March 2027 15 March 2027 – 21 March 2027 5
22 March 2027 22 March 2027 – 28 March 2027 5
29 March 2027 29 March 2027 – 31 March 2027 3

The first and last weeks

The first week of the range, day by day:

Date Day of the week
1 January 2027 Friday
2 January 2027 Saturday
3 January 2027 Sunday
4 January 2027 Monday
5 January 2027 Tuesday
6 January 2027 Wednesday
7 January 2027 Thursday

And the last week:

Date Day of the week
25 March 2027 Thursday
26 March 2027 Friday
27 March 2027 Saturday
28 March 2027 Sunday
29 March 2027 Monday
30 March 2027 Tuesday
31 March 2027 Wednesday

How the count is worked out

The range is counted month by month, because the months have different lengths. January has 31 days, February has 28 days, March has 31 days — 90 days in total. The weekdays are counted from the real calendar: each month starts on a different weekday, so the number of Saturdays and Sundays differs from month to month, and the table above shows the exact split. The business days subtract the US federal holidays that fall on weekdays in the range: New Year's Day (1 January), Martin Luther King Jr. Day (18 January), Presidents' Day (15 February).

The range in the year

The range from 1 January to 31 March 2027 starts 0 days into the year and leaves 275 days after it ends — 365 days in the year in total, since 2027 is not a leap year. It spans the whole of quarter Q1 of 2027, and it begins in winter in the Northern Hemisphere (the seasons are reversed in the Southern Hemisphere).

The federal holidays inside the range are New Year's Day (1 January 2027), Martin Luther King Jr. Day (18 January 2027), Presidents' Day (15 February 2027). Each one that falls on a weekday costs a business day — that is why the business day count (61) is lower than the weekday count (64). If you are planning a project or a deadline across this range, the holidays are the days to check first, before you promise a date.

The same range in other years

Year Total days Weekdays Business days
2026 90 64 61
2027 90 64 61
2028 91 65 63

The range is 90 days in 2027 and the same number of days in the adjacent years, except where February is involved: a leap year adds one day to any range that includes February. This range includes February, so it is one day longer in a leap year (2027 is not a leap year; the next leap year is 2028).

Frequently asked questions

How many days are there between 1 January and 31 March 2027?

90 days inclusive (89 days by the standard days-between convention, which does not count the start day). Of those, 64 are weekdays and 61 are business days.

How many business days are in this range?

61 business days — 64 weekdays minus the federal holidays that fall on weekdays in the range.

How many weeks is 90 days?

12 weeks and 6 days.

How do you count days between two dates?

Count the days you add to the start date to reach the end date. The days between dates calculator does it for any two dates, and shows the answer in days, weeks and months.

What is the same range in 2028?

See the table above for the 2028 figures — the total is the same unless the range includes February in a leap year.

Sources

  • IANA Time Zone Database, via Node.js Intl (Intl.DateTimeFormat with timeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory.
  • TimeFlow's own time-zone data (data/cities.ts, data/dst.ts), computed from the IANA database.
  • US federal holiday rules (5 U.S.C. § 6103): the holidays subtracted in the business day count are the eleven federal holidays, on the dates set by law.
  • TimeFlow's days between dates calculator and business days calculator — the live tools behind the counts on this page.
  • Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.