Date Difference Calculator

What this calculator tells you

Pick any two dates and you get the gap between them in three different ways: a calendar breakdown (years, months, days), a plain count of days and weeks, and the number of Monday-to-Friday working days. Each answer suits a different job — notice periods and contract terms are usually written in months, project schedules in working days, and interest or rent calculations in days.

Counting days: the “fence post” problem

From 1 January to 3 January is two days if you count the nights in between, but three days if you count every date on the calendar. Neither is wrong; it depends on the context.

• Exclusive (default): end − start. Use it for durations, ages, interest periods and “days until”.
• Inclusive: end − start + 1. Use it for leave applications, hotel stays quoted per date, and legal notice periods that say “both days inclusive”.

Tick “Include end date” to switch between the two. The weeks, months and working-day figures all follow the same choice.

How months and years are worked out

The calendar breakdown moves forward from the start date in whole years, then whole months, then days. So 31 January to 28 February is 28 days (0 months) in a common year, but 31 January to 1 March is 1 month and 1 day. This mirrors how banks compute tenure and how HR departments compute service periods.

Example: 10 March 2024 to 15 September 2026 → 2 years, 6 months, 5 days; 919 days in total; 131 weeks and 2 days; 656 working days.

Working days

Working days are counted as every Monday to Friday in the range. Whole weeks contribute five days each and the leftover days are checked individually, so long ranges are computed instantly. National and state holidays (Diwali, Eid, Christmas, Republic Day, and so on) are not removed because they differ from state to state and year to year — subtract them yourself for a precise count. If your workplace runs a six-day week, add back the Saturdays: number of full weeks plus any partial-week Saturday.

Practical uses

• Notice period: resignation date to last working day, inclusive.
• Visa or passport validity: today to the expiry date, to check whether the six-month rule is met.
• Loan or FD interest: exact days between disbursement and repayment, since most Indian banks use actual/365 day counts.
• Pregnancy or medical follow-ups: weeks and days from a reference date.
• Project planning: working days between kick-off and deadline to estimate effort.

Tips

• If you enter the dates the wrong way round, the calculator swaps them and tells you, so you never get a negative answer by accident.
• The weekday of both dates is shown, useful for checking whether a deadline lands on a weekend.
• For “how many days until an event”, leave “Include end date” unticked and set the start date to today.

Frequently asked questions