How many days are between two dates?
Enter the first and second date, then select Calculate Difference. The exact day count excludes the end date: 1 January to 2 January is one day, and the same date is zero days. Reversing the dates gives the same duration. Time of day is not included.
Calendar months and exact days
Months have different lengths. Whole calendar months are counted from the earlier date, clamping its day to the last day of the target month, then counting the remaining days. For example, 31 January to 1 March 2026 is 29 elapsed days, or one calendar month and one day. Approximate months and years are shown separately and are not calendar units.
For age from a birth date to a chosen date, use the Age Calculator between two dates. It lets you change the target date from today to another date.
Count business days
The Business Days mode counts Monday to Friday and includes both start and end dates. Enable Exclude Holidays in Advanced Settings to omit standard US federal holidays and observed weekdays for 1986–2099. For example, 3 July 2026 is the observed Independence Day holiday, so it contributes zero workdays when exclusion is enabled.
A holiday falling on Saturday is normally observed on Friday, and one falling on Sunday on Monday. This includes an observed New Year's Day falling in the previous December. Juneteenth is included from 2021. Regional Inauguration Day and employer-specific holidays are not included. The maximum business-day range is 100 years. See the US Office of Personnel Management holiday calendar for the federal schedule.
Use the Business Days Calculator for a dedicated workday view. Neither calculator determines legal, payroll or contractual deadlines; apply the rules of your organization or jurisdiction.
Add days or find a weekday
Choose Date Arithmetic to add or subtract calendar days, including weekends. Choose Day Finder to see a date's weekday. Inputs are calendar dates, so daylight-saving changes do not change the number of days between them.
Saved history and privacy
Calculations run in this browser. Recent calculations and display preferences are saved locally when browser storage is available; use Clear History to remove saved calculations. The calculator still works when storage is blocked. Copying, exporting or sharing a result includes the dates you entered, so share only information you intend to disclose.