Time Between Two Dates Calculator

The time-between-dates calculator subtracts one date from another and returns the result in multiple shapes: years/months/days (age-style), total days (for contracts), weeks, hours, and business days (excluding Friday/Saturday + public holidays). Useful for contract management, leave administration, and payment terms.

How the calculation works

Base difference = milliseconds between the two dates ÷ milliseconds in a day. The years/months breakdown uses a borrowing algorithm: when the end day is smaller than the start day, the value is borrowed from the previous month. Business days are counted day-by-day, skipping Friday/Saturday and listed holidays.

Worked example

A supply contract from 1 January 2026 to 31 December 2026:

1. Total difference: 364 days
2. In weeks: 52 weeks
3. In months: 11 months and 30 days
4. Business days with a Sat–Sun weekend: 261 days
5. Business days with a Fri–Sat weekend: 260 days

The weekend is not the same everywhere

Weekends differ by country: Friday and Saturday across most of the Gulf and Egypt, Saturday and Sunday in Europe, the Americas and much of Asia, and a six-day week in some markets. That is why the tool asks which two days to skip instead of assuming them — the choice flips the term of a contract signed between two countries.

Public holidays are yours to subtract

• Founding Day: 22 February (fixed Gregorian).
• Eid al-Fitr: 4-day public-sector holiday (variable, lunar).
• Eid al-Adha: 4-day public-sector holiday (variable, lunar).
• National Day: 23 September (fixed Gregorian).

Commercial use cases

• Computing remaining contract duration in days or months.
• Counting workable project days.
• Tracking the 90-day probation window for a new hire.
• Calculating remaining annual leave from a hire date.
• Setting an invoice due date by adding Net 30 / 60 / 90.