Date difference calculator
Pick the start and end dates to see how many days, weeks, months and business days lie between them.
Free · no sign-up The values you type stay in your browser: nothing is sent or stored.
Days
364
- Full weeks
- 52
- Full months
- 11
- Business days (no holidays)
- 260
Your result in words
From 1/1/2026 to 12/31/2026 there are 364 days, or 52 full weeks and 11 full months, with 260 business days (holidays not deducted).
An estimate for information only, without tax, fees or inflation. The real result may differ.
How it works
What the calculator shows
The interval between two dates in calendar days, full weeks and full months, and how many of those days are business days, Monday to Friday.
Holidays
Business days only skip weekends. National, state and local holidays are not deducted; subtract them by hand if needed.
Formula
How to calculate
D is the number of days between the dates (d with subscript 2 is the end and subscript 1 the start) and S the full weeks. Months and business days are counted on the calendar.
Example
With round numbers, so you can check the math:
From 1/1/2026 to 12/31/2026 there are 364 days, or 52 full weeks and 11 full months, with 260 business days (holidays not deducted).
Frequently asked questions
Does the start day count?
Days count from the start date up to the end date, not including the end day. From Jan 1 to Jan 8 is 7 days.
Does the order of the dates matter?
No. If the end date is before the start date, the calculator swaps them.
Are leap years included?
Yes. The calculation uses the real calendar, so February 29 is counted.
Math checked by the JuntaTudo team · updated on Nov 12, 2026
