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Dates & days · calculator

Business days calculator

Add or subtract business days from a date, or count the business days between two dates. Weekends and federal holidays are skipped, and every skipped day is shown on the calendar with its name.

Business days

Example
Thu, Jan 7, 202730 business days after Mon, Nov 23, 202645 calendar daysFull result
What do you need?
Direction

1 to 2,000

Days that are not business days

Sundays always; Saturdays unless you tick the box below.

OPM’s observed dates, 2025–2029. A holiday on a Saturday is observed the Friday before. The Federal Reserve Banks’ calendar differs: they stay open on that Friday, so a bank’s business days can differ from this count.

Any day your workplace is closed (a state holiday, a shutdown): add each one.

Worked examples

Business day 30 is

Thu, Jan 7, 2027

Thursday, January 7, 2027 is 30 business days after Monday, November 23, 2026.

The start date is day 0 and is never counted; the answer is the last day counted.

Thursday, January 7, 2027 is 30 business days after Monday, November 23, 2026.

RuleWeekends and the 11 federal holidays (5 U.S.C. 6103) on OPM’s observed dates, 2025–2029Sources checked How the math works ↓

  • 45 calendar days later
  • 12 weekend days
  • 3 federal holidays

Holidays skipped

  • Thu, Nov 26, 2026 Thanksgiving Day
  • Fri, Dec 25, 2026 Christmas Day
  • Fri, Jan 1, 2027 New Year’s Day

The days, counted

Nov 23, 2026 – Jan 7, 2027
  • Counted, numbered
  • Weekend, skipped
  • Holiday or closed, skipped
  • Start date
  • The answer
The same days as a list
  1. Mon, Nov 23, 2026: start date, day 0, not counted
  2. Tue, Nov 24, 2026: business day 1
  3. Wed, Nov 25, 2026: business day 2
  4. Thu, Nov 26, 2026: Thanksgiving Day, not counted
  5. Fri, Nov 27, 2026: business day 3
  6. Sat, Nov 28, 2026: weekend, not counted
  7. Sun, Nov 29, 2026: weekend, not counted
  8. Mon, Nov 30, 2026: business day 4
  9. Tue, Dec 1, 2026: business day 5
  10. Wed, Dec 2, 2026: business day 6
  11. Thu, Dec 3, 2026: business day 7
  12. Fri, Dec 4, 2026: business day 8
  13. Sat, Dec 5, 2026: weekend, not counted
  14. Sun, Dec 6, 2026: weekend, not counted
  15. Mon, Dec 7, 2026: business day 9
  16. Tue, Dec 8, 2026: business day 10
  17. Wed, Dec 9, 2026: business day 11
  18. Thu, Dec 10, 2026: business day 12
  19. Fri, Dec 11, 2026: business day 13
  20. Sat, Dec 12, 2026: weekend, not counted
  21. Sun, Dec 13, 2026: weekend, not counted
  22. Mon, Dec 14, 2026: business day 14
  23. Tue, Dec 15, 2026: business day 15
  24. Wed, Dec 16, 2026: business day 16
  25. Thu, Dec 17, 2026: business day 17
  26. Fri, Dec 18, 2026: business day 18
  27. Sat, Dec 19, 2026: weekend, not counted
  28. Sun, Dec 20, 2026: weekend, not counted
  29. Mon, Dec 21, 2026: business day 19
  30. Tue, Dec 22, 2026: business day 20
  31. Wed, Dec 23, 2026: business day 21
  32. Thu, Dec 24, 2026: business day 22
  33. Fri, Dec 25, 2026: Christmas Day, not counted
  34. Sat, Dec 26, 2026: weekend, not counted
  35. Sun, Dec 27, 2026: weekend, not counted
  36. Mon, Dec 28, 2026: business day 23
  37. Tue, Dec 29, 2026: business day 24
  38. Wed, Dec 30, 2026: business day 25
  39. Thu, Dec 31, 2026: business day 26
  40. Fri, Jan 1, 2027: New Year’s Day, not counted
  41. Sat, Jan 2, 2027: weekend, not counted
  42. Sun, Jan 3, 2027: weekend, not counted
  43. Mon, Jan 4, 2027: business day 27
  44. Tue, Jan 5, 2027: business day 28
  45. Wed, Jan 6, 2027: business day 29
  46. Thu, Jan 7, 2027: end date, business day 30

Calculated with Punch Clock Math · rules checked October 22, 2026 · an estimate, not legal or tax advice · punchclockmath.com

How the math works

The calculator walks the calendar one day at a time. It never estimates with “5 out of 7 days”.

  1. A business day is a Monday to Friday that is not a holidaySaturdays and Sundays are skipped (tick “Count Saturdays” for a six-day week). So is every observed federal holiday and every closed date you add.
  2. The 11 federal holidaysNew Year’s Day, January 1; Birthday of Martin Luther King, Jr., third Monday in January; Washington’s Birthday, third Monday in February; Memorial Day, last Monday in May; Juneteenth National Independence Day, June 19; Independence Day, July 4; Labor Day, first Monday in September; Columbus Day, second Monday in October; Veterans Day, November 11; Thanksgiving Day, fourth Thursday in November; Christmas Day, December 25.5 U.S.C. 6103 - Holidays (U.S. Code, 2024 ed.)
  3. Weekend holidays move to a weekdayFor federal employees on a Monday-Friday schedule: a holiday on Saturday is observed the preceding Friday (5 U.S.C. 6103(b)(1)); a holiday on Sunday is observed the following Monday (Executive Order 11582, sec. 3(a), as stated by OPM). OPM: “the holiday usually is observed on Monday (if the holiday falls on Sunday) or Friday (if the holiday falls on Saturday).”5 U.S.C. 6103 - Holidays (U.S. Code, 2024 ed.) · Federal Holidays
  4. Adding N business daysThe start date is day 0. Step one calendar day forward (or back, to subtract) and count each business day; the Nth one counted is the answer. Example: Mon, Nov 23, 2026 + 30 is Thu, Jan 7, 2027, after skipping Thanksgiving Day, Christmas Day and New Year’s Day.
  5. Counting between two datesBy default the start date is not counted and the end date is: Monday to Friday of one week is 4 business days. Tick both boxes to count both ends: Nov 23, 2026 to Dec 31, 2026 is then 27.
  6. A holiday can sit in the year beforeNew Year’s Day 2028 (Jan 1, 2028) falls on a Saturday. OPM lists its observed date as Friday, December 31 (2027) in the 2028 schedule, so calendar year 2027 contains 12 observed federal holidays and calendar year 2028 contains 10 (no January date). So Thu, Dec 30, 2027 + 1 business day is Mon, Jan 3, 2028.Federal Holidays

What this doesn’t cover

  • Bank and Federal Reserve calendars: When a holiday falls on a Saturday, federal offices close the Friday before, but the Federal Reserve Banks stay open that Friday. A payment or settlement deadline can therefore land on a different day. Check your bank’s own calendar.
  • State and local holidays: State holidays (and city or county ones) are not in our data. Add them as closed dates.
  • Your employer’s holidays: Federal employees’ pay and leave only. Private employers are not required by federal law to give or pay holidays. Your employer may close on other days too; add those as closed dates.
  • Years outside 2025–2029: Not modeled — holiday dates for other years are not in our data yet (checked 2026-10-22). Weekends are still skipped and the result says so.
  • Inauguration Day: Inauguration Day (DC-area federal employees only) is left out.
  • Court and legal deadlines: Courts and agencies set their own rules for counting deadlines. Follow the rule that applies to your deadline.

  • Guide · Rules

    Federal Holidays and Business Days, 2026–2027

    The 11 federal holidays with observed dates for 2026 and 2027, the weekend rule, the December 31, 2027 trap, and how to count business days.

    Updated · 5 min read

  • Guide · Overtime

    Is Holiday or Weekend Work Overtime?

    Under federal law, holiday and weekend hours are ordinary hours that count toward 40, and paid holidays off don’t. The state rules that add a premium.

    Updated · 5 min read

Page sources

Every rule above comes from these pages, read on the dates shown.

  1. 5 U.S.C. 6103 - Holidays (U.S. Code, 2024 ed.)U.S. Government Publishing Office (govinfo) · read
  2. Federal HolidaysU.S. Office of Personnel Management · read
  3. K.8 — Holidays Observed by the Federal Reserve System 2026–2030Board of Governors of the Federal Reserve System · page dated Last update: July 8, 2026 · read