Date Difference Calculator

Project plans, visa cover letters and rental agreements in India constantly need the number of days between two calendar dates. From 1 January 2026 to 31 December 2026 this page counts 364 days — because it measures the span between those midnights, not “a year has 365 days” as a slogan. Weeks and a 30.44-day month approximation sit beside the exact day count.

A number you need in a queue

A contractor in Bhubaneswar billing “90 days from kickoff” and a student counting a passport validity window should not rely on mental month-math. IndiaKit subtracts the two date values and reports days, weeks, and approximate months so you can see the same span three ways.

How the lookup or formula runs

Days = |end − start| in milliseconds ÷ 86,400,000. Defaults 2026-01-01 to 2026-12-31 → 364 days, 52 weeks, about 12 months using 30.44 days per month (365.25/12).

The end date is not added as an extra inclusive day unless it equals a full 24-hour step. If a court or a bank says “inclusive of both days,” add 1 to the result yourself.

Time of day is not in the form; dates are treated as calendar dates. IST versus UTC is irrelevant unless you are crossing midnight with timestamps, which this tool does not take.

Planning 2026 as a 364-day span

A Bhubaneswar consultancy sets a project from 1 January 2026 to 31 December 2026. The difference tool shows 364 days, not 365, because 31 December minus 1 January is 364 midnights. They add 1 when the contract language says both dates are inclusive.

What we do not store

No holidays, no IST business-hour cuts. Leap days inside the range are included automatically by the calendar. For working days excluding Sundays, use the working-days tool.

Common questions

Why is 1 Jan to 31 Dec 364 days, not 365?

Because the subtraction counts the gap between the two dates, not the count of dates in the year. 1 Jan to 1 Jan next year is 365 days in a non-leap year (366 if leap).

Does this skip Sundays?

No. Every calendar day counts. Use Working Days if you need weekdays only.

Can I use it for age?

You can, but the age calculator reports years and months the way Indian forms expect. Date difference is better for contracts and visas.