Date Difference Calculator

Which two dates, and does the last one count

Type a start date and an end date. The order does not matter; the tool measures the gap either way. The third field is the one that decides arguments.

Count the end date: No gives the number of nights, or the number of days that have passed. Monday to Friday is 4. This is what you want for “how many days until NEET”, for an FD tenure, and for anything a bank does.

Count the end date: Yes gives the number of days occupied. Monday to Friday is 5. This is what an HR portal does when you apply for leave from the 10th to the 14th, and what a notice-period clause usually means by “90 days”.

The two answers differ by exactly one, and one day is the difference between a leave balance going to zero and going negative, or between a resignation being accepted and being one day short.

The calculator gives five figures:

days          = whole calendar days from start to end (+1 if the end counts)
calendar diff = years, months, days, borrowing real month lengths
weeks         = days / 7
working days  = every Monday to Friday in the range, no holidays deducted
hours         = days × 24

The calendar breakdown is a separate calculation from the day count, not a conversion of it. Months are 28 to 31 days long, so “11 months, 10 days” and “344 days” are both correct and neither can be derived from the other by dividing by 30.

The default example: 15 January to 25 December 2026

Days	344
Calendar difference	11 months, 10 days
Weeks	49.14
Working days	246
Hours	8,256

Eleven whole months take you from 15 January to 15 December, and ten more days reach the 25th. Eleven months at “30 days each” would be 340, and that four-day gap is the whole reason the breakdown is shown separately.

Set “count the end date” to Yes and the figures become 345 days and 247 working days, because 25 December 2026 is a Friday. The tool counts it as a working day. Christmas is a gazetted holiday everywhere in India, so a real office would not. That is the kind of day you subtract yourself, and the next section is about why.

Notice periods, leave and the exam countdown

The reason someone in India opens this page is rarely curiosity. It is one of these.

Notice period. A 90-day notice starting from a resignation submitted on 24 September 2026, counting both ends, finishes on 22 December. Most HR systems count the day you resign as day one, but some start the clock the next day, and the offer letter usually says “90 days” without saying which. Look at the clause, then set the end-date toggle to match. Buyout amounts are computed on the shortfall in days, on gross or on basic depending on the policy, so being one day out on a ₹1.2 lakh a month gross salary is roughly ₹4,000.

FD maturity. Banks quote tenure in days and count from the value date without including the maturity date. The 444-day special deposits that SBI and Bank of Baroda ran in 2024 and 2025 matured 444 nights later, not 445. Put the booking date and the maturity date on the receipt into the tool, leave the toggle on No, and the days figure should match the receipt. If it does not, the bank has counted from the day the cheque cleared, not the day you handed it in. The FD calculator works out the interest once the tenure is settled.

Leave. Earned leave in most private companies accrues at 1.25 to 1.75 days a month depending on the state’s Shops and Establishments Act, so a leave balance is a count of whole days and the toggle belongs on Yes. Watch the sandwich rule: leave on Friday and Monday is often counted as four days because the weekend between is “sandwiched”. Central government leave rules let you prefix and suffix holidays without them counting, but many private HR policies do not, and Darwinbox or Keka will apply whatever the company configured.

Days to the exam. From 24 September 2026 to a NEET on 2 May 2027 is 220 days; to a UPSC prelims in late May, a few weeks more. The days figure with the toggle on No is the number of full study days you have. Divide it by the number of chapters and it becomes a schedule, which is what the tool is really for at 10 pm in October.

Limitation and legal deadlines. Section 9 of the General Clauses Act excludes the first day and includes the last when a period is described as “from” one date “to” another. A 30-day appeal window from an order dated the 1st ends on the 31st, not the 30th. Lawyers know this; the rest of us learn it once.

Working days in India are not Monday to Friday

The working-days figure is the plain count of Mondays through Fridays in the range. It deducts nothing else, and in India that leaves a lot out.

Banks close on the second and fourth Saturday. Most schools and many state government offices work six days. Public holidays are set state by state under the Negotiable Instruments Act, so Onam closes Kerala, Pongal closes Tamil Nadu, Ganesh Chaturthi closes Maharashtra, and none of them close Delhi. Even the central list of gazetted holidays runs to 17 a year, on top of restricted holidays that each employee picks.

So use the figure as a ceiling. For a courier delivery estimate or a cheque-clearing window, take the working days, subtract the second and fourth Saturdays if a bank is involved, then subtract the state holidays that fall in the range. For anything with a legal consequence, ask the office that will enforce the deadline which calendar it uses. A Bengaluru company’s HR calendar and a Karnataka court’s calendar are not the same document.

What the tool cannot know

It does not know your state. It does not know whether your company’s leave policy sandwiches weekends. It does not know that 25 December is a holiday. It counts calendar days precisely, which is the part people get wrong by hand, and leaves the local knowledge to you.

Time zones and daylight saving do not come into it. India has one time zone and no clock changes, and the dates are handled as plain calendar dates anyway, so the hours figure is always days times 24.

If the second date is a date of birth and you want an age as on a cut-off, the age calculator is the right tool: it handles the “as on 1 August” convention that UPSC and the banking exams use, and 29 February birthdays. And if the question is “how many days of the financial year are left to put money into PPF before 31 March”, the answer is this tool with the toggle on Yes, and then the PPF calculator for what the deposit will earn.