time calculator

Business Days Calculator

Add business days to a start date while skipping weekends automatically.

Results

Result year
2025.00
Result month
2.00
Result day
17.00

How to use this calculator

  1. Enter a start date (year, month, day).
  2. Enter the number of business days to add (use a negative number to count backward).
  3. Choose whether to include weekends or skip them.
  4. See the resulting date with weekends handled per your choice.

Inputs explained

Start date
Year, month, and day where counting begins.
Business days
Number of weekdays to move forward (or backward if negative).
Count weekends?
Default skips Saturday/Sunday; switch to include if you operate 7 days a week.

How it works

We move forward one day at a time and only count Monday–Friday unless you choose to include weekends.

Holiday support is on the roadmap; for now add an extra day manually if a holiday falls inside your range.

Formula

Business date = Start date + N weekdays

When to use it

  • Calculating invoice due dates with net terms that exclude weekends.
  • Planning follow-ups or service tickets for weekday-only teams.
  • Working back from a deadline in business days instead of calendar days.

Tips & cautions

  • Enter a negative business-day value to count backward to a start date.
  • If you need holidays excluded, subtract them manually until holiday calendars are supported.
  • For full calendar-day counting, use the Add Days calculator instead.
  • Holiday skipping isn’t built-in yet; handle them manually.
  • Weekend definition is fixed to Saturday/Sunday; regions with different weekends aren’t configurable.
  • Assumes the Gregorian calendar and local timezone.

Worked examples

Net-10 invoice

  • Feb 3 + 10 business days = Feb 17 (skips both weekends)

Include weekends

  • Set ‘Count weekends’ to Yes if you’re dealing with 7-day support teams.

Deep dive

This business days calculator adds or subtracts weekdays from a start date while skipping weekends. Enter your start date, number of business days, and choose whether weekends count to get the exact due date.

Perfect for invoices, follow-ups, and project schedules when only Monday–Friday matters. Holidays aren’t skipped yet, so add extra days manually for regional holidays.

FAQs

Does it know holidays?
Not yet. Add an extra day for each holiday until regional holiday calendars are added.
Can I count backwards?
Enter a negative number to move backward in business days.
Can I change which days are weekends?
Weekend skipping is fixed to Saturday/Sunday for now. Future versions may allow custom weekends.
Does time zone matter?
Dates are based on local time. For distributed teams, align to UTC to avoid date shifts around midnight.
How do I include holidays?
Manually add a day for each holiday in your range. Built-in holiday calendars are planned but not available yet.

Related calculators

Weekends are based on the standard Saturday/Sunday definition. Holidays must be added manually for now.