Date Calculator
Our free date calculator for the United States lets you find the number of days between two dates, count business days with federal holidays excluded, add or subtract days from any date, and calculate your exact age in years, months, and days. Results update live as you type.
How to count days between two dates
Enter a start date and an end date in the Date Difference tab. The calculator returns the total calendar days, the number of business days (Monday–Friday excluding federal holidays), weekend days, and a list of any federal holidays within the range.
Business day counts matter for legal deadlines, contract payment terms, court filing windows, and HR notice periods. The US follows a Sunday-to-Saturday calendar week, but the business week runs Monday through Friday. Federal holidays are the eleven days on which federal offices close — individual states may observe additional holidays not reflected here.
US federal holidays 2026
The eleven US federal holidays in 2026 are: New Year's Day (1 January), Martin Luther King Jr. Day (19 January — third Monday in January), Presidents' Day / Washington's Birthday (16 February — third Monday in February), Memorial Day (25 May — last Monday in May), Juneteenth National Independence Day (19 June), Independence Day observed (3 July — Friday, since 4 July falls on Saturday), Labor Day (7 September — first Monday in September), Columbus Day (12 October — second Monday in October), Veterans Day (11 November), Thanksgiving Day (26 November — fourth Thursday in November), and Christmas Day (25 December).
Many private employers observe additional days such as the day after Thanksgiving, Christmas Eve, or state-specific holidays. The calculator covers federal holidays only.
Add or subtract days from a date
Use the Add / Subtract tab to find a date that is a set number of days, weeks, months, or years from a starting point. Toggle "Business days only" to skip weekends and federal holidays — useful for 30-day payment terms, 10-business-day delivery windows, or 60-day legal response deadlines.
Example: A contract signed on 1 June 2026 with a 45-business-day performance period ends on 4 August 2026, after stepping past the Juneteenth holiday on 19 June and Independence Day observed on 3 July.
Age calculator
The Age tab shows your exact age as of today or any reference date: years, months, days, total days alive, total weeks, and days until your next birthday. Useful for Social Security eligibility (full retirement age depends on birth year), Medicare enrollment (you can enroll starting 3 months before your 65th birthday), or verifying age for legal purposes.
US week numbering
The United States uses a Sunday-to-Saturday week, where week 1 begins on 1 January regardless of the day of the week. This differs from the ISO 8601 system used in Europe. Use the Week Number tab to find which week number a date falls in under the US system — relevant for US payroll cycles, school calendars, and retail fiscal weeks.
FAQ
- How many business days are there in 2026 in the US?
- There are 250 business days in 2026 in the United States (365 calendar days minus 105 weekend days and 11 federal holidays, adjusted for the Independence Day substitute on 3 July). Actual working days vary by employer and state.
- Does this calculator include state holidays?
- No — the calculator includes the 11 federal holidays only. State holidays such as Patriots' Day in Massachusetts, César Chávez Day in California, or Columbus Day substitutes vary widely. Federal offices, banks, and the stock exchange observe federal holidays; state offices observe their own calendars.
- What is the difference between calendar days and business days?
- Calendar days count every day of the year. Business days count Monday through Friday, excluding federal holidays. Contracts, court rules, and financial regulations specify which type applies — always check. The Federal Rules of Civil Procedure, for example, use calendar days for most deadlines.
- When is Thanksgiving 2026?
- Thanksgiving 2026 falls on Thursday, 26 November (the fourth Thursday in November). The day after Thanksgiving — Black Friday — is not a federal holiday, though many employers grant it as a discretionary day off.
- How do I calculate a 30-day notice period?
- Enter your notice start date in the Add / Subtract tab, choose "Days" as the unit, enter 30, and select whether you want calendar days or business days. Most residential lease notice periods in the US use calendar days. Employment contracts vary — check your agreement.