Project planning
Measure how many working days sit between kickoff and launch.
Unit Converter
Date Calculator for Planning Timelines and Deadlines
Count days between dates, add or subtract days from a date, and compare weekdays with holiday-aware business days.
Use one page for the most common date tasks: find the number of days between two dates, calculate a future or past date, and understand how weekends and national holidays change your working-day total.
Calendar-day difference
Date after or before N days
Weekdays only vs business days with holidays
Count days between dates
Pick a start and end date to measure the calendar span. Results use standard “between dates” semantics, so the same day returns 0 days.
Quick planning presets
Set the end date from the start date with one tap for common planning horizons.
Days between your dates
There are 30 calendar days between Feb 27, 2026 and Mar 29, 2026.
Months and years are approximate so you can estimate longer timelines quickly.
Calendar days
30
Weekdays only (Mon–Fri)
20
Counts weekdays after the start date up to the end date.
Selected workweek days
20
Mon-Fri
Business days with holidays
20
Starts from the weekday count, then removes national public holidays for the selected country.
Weeks (exact)
4.29
Months (approx.)
0.99
Years (approx.)
0.082
Excluded holidays
No holiday dates were excluded for the current range and workweek.
Add or subtract days from a date
Find the date after 7, 30, or 90 days, or move backward from a deadline to a planning start date.
Offset shortcuts
Use positive values for future dates and negative values for past dates.
+30 days from Mar 29, 2026 is Apr 28, 2026.
Resulting date
Apr 28, 2026
Day of week
Tuesday
Weekdays and business days
Compare the raw weekday count with a holiday-aware business-day count so you can plan staffing, approvals, shipping, and project schedules more accurately.
The holiday-aware count uses public holidays for the selected scope.
Optional. Use a more specific holiday scope when your planning depends on state-level public holidays.
Custom workweek
Pick the weekly schedule that matches your team, operation, or market before holidays are removed.
United States
Public holidays can be filtered by the selected holiday scope. Company shutdowns and custom leave calendars are not included.
2026
When this date calculator helps most
Shipping and procurement
Check whether a quoted lead time includes weekends or public holidays.
HR and operations
Count business days across notice periods, onboarding windows, or approval timelines.
Date calculator FAQs
Why is the same day equal to 0 days?
This page uses standard “days between dates” semantics. If the start date and end date are identical, no calendar days have elapsed between them.
What is the difference between weekdays and business days?
Weekdays count Monday through Friday only. Business days with holidays start from that weekday total and then remove national public holidays for the selected country.
Are holidays always complete for every region?
No. The holiday-aware total is based on national public holidays for the selected country. Regional holidays, company shutdowns, and custom calendars are not included.
Can I calculate dates in the past as well as the future?
Yes. Use a negative offset to move backward from a date, or reverse the start and end dates in the span calculator. The page normalizes reversed inputs automatically.
Why are months and years marked as approximate?
Months and years have different lengths. The calculator still shows approximate month and year values so you can quickly estimate longer timelines without confusing them with exact calendar-month counts.