Date Calculator

How many days until your vacation? How long ago was that meeting? This date calculator instantly finds the number of days between any two dates, or adds/subtracts days from any starting date.

How to Use This Calculator

1. Days between two dates: Enter start and end date → get total days, weeks, months, and years between them.
2. Add/subtract days: Enter a start date and number of days to add or subtract → get the resulting date.
3. Toggle include/exclude weekends for business day calculations.

Example Calculations

Days between January 1, 2025 and December 31, 2025:

• Total days: 364 (not 365 — excludes the start date, counts up to but not including end date)
• Business days (Mon–Fri): ≈ 260

Add 90 days to March 1, 2026:

• Result: May 30, 2026

Common Uses

• Payment terms (Net 30, Net 60 due date)
• Contract deadlines and expiration dates
• Countdown to events (wedding, vacation, retirement)
• Medical timelines (prescription duration, recovery milestones)
• Legal deadlines and statute of limitations

Frequently Asked Questions

Does the date calculator handle leap years?

Yes — leap years (years divisible by 4, with century-year exceptions) are automatically accounted for. February 29 is handled correctly for all calculations.

How do I find business days between dates?

Select the "exclude weekends" option. For official holidays, you'll need to manually adjust the count (or note the holidays separately) as holiday schedules vary by country and organization.

What is the difference between calendar days and business days?

Calendar days include all days (Monday through Sunday). Business days count only weekdays (Monday–Friday). A "Net 30" payment term typically means 30 calendar days, not business days.

Conclusion

The date calculator is an everyday tool for planning, contracts, deadlines, and counting down. Use it for any date arithmetic — from simple countdowns to complex business-day calculations.

Related: Age Calculator | Day Counter | Time Calculator