Time & Date Suite

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Date Calculator: Add, Subtract & Difference Between Dates

Add or subtract years, months, weeks, days. Find the difference between two dates. Exclude weekends and holidays.

Configuration

Date Analysis

Target Date: Wednesday, February 25, 2026

Total Breakdown

Months0 Months
Weeks0 Weeks
Days0
Hours0 Hours
Minutes0 Minutes
Seconds0

Information Hub

Add/Subtract Mode

Start from a base date and add or subtract years, months, weeks, and days. The calculator handles variable month lengths and leap years. The result shows the target date and day of the week, plus a total breakdown (months, weeks, days, hours, minutes, seconds) with remainders when applicable.

Difference Mode

Enter start and end dates to get the exact duration (years, months, days) and a total breakdown (months, weeks, days, hours, minutes, seconds) with remainders when applicable. When "Exclude Weekends" or "Exclude Holidays" is enabled, the business-day count is shown for project timelines and work schedules.

Working with Dates

Date arithmeticโ€”adding time, subtracting time, or finding the span between two datesโ€”powers project planning, deadlines, and schedules. Here's how add/subtract and difference modes work, and when to exclude weekends and holidays.

Modes

Add/Subtract

Start from any date and add or remove years, months, weeks, or days. Handy for "90 days from now?" or "6 months before this deadline."

Difference

Get the exact span between two dates in years, months, and days. Total day count helps with contracts and timelines.

Business Days

Check "Exclude Weekends" and "Exclude Holidays" (e.g. US Federal) to count only working daysโ€”useful for project timelines and SLAs.

Locale Formatting

Numbers use locale-aware formatting (e.g. commas for thousands) so results read naturally across regions.

Date Calculator: Add, Subtract & Difference Between Dates

Add or subtract years, months, weeks, days from any date. Find the difference between two dates. Exclude weekends and US Federal holidays for business-day counts. Free, runs locally, no sign-up.

How to Use the Date Calculator

  • Add/Subtract Time:
    Pick a base date, enter years, months, weeks, and days, then choose Add (+) or Subtract (โˆ’). Get the target date, day of the week, and total days.
  • Difference Between Dates:
    Enter start and end dates for exact duration (years, months, days) and total day count.
  • Exclude Weekends:
    Check to count only weekdaysโ€”useful for business timelines.
  • Exclude Holidays:
    Check and select "US Federal Holidays" to exclude observed federal holidays from the count.

Date Difference Math

The total day count between two dates comes from the millisecond difference: Days=โŒŠendmsโˆ’startms86,400,000โŒ‹\text{Days} = \left\lfloor \frac{\text{end}_{\text{ms}} - \text{start}_{\text{ms}}}{86{,}400{,}000} \right\rfloor. Leap years and variable month lengths are handled automatically when adding or subtracting months and years.

US Federal Holidays

With "Exclude Holidays" and "US Federal Holidays," the calculator skips: New Year's Day (Jan 1), Martin Luther King Jr. Day (3rd Mon Jan), Presidents' Day (3rd Mon Feb), Memorial Day (last Mon May), Juneteenth (June 19), Independence Day (July 4), Labor Day (1st Mon Sep), Columbus Day (2nd Mon Oct), Veterans Day (Nov 11), Thanksgiving (4th Thu Nov), and Christmas (Dec 25). Weekend observations follow federal rules.

Date Calculator FAQ

? How do I add or subtract days from a date?

Use "Add/Subtract Time" mode: pick a base date (default today), enter years, months, weeks, days, then Add (+) or Subtract (โˆ’). The result shows the target date, day of week, and total days/weeks/hours.

? How do I find the difference between two dates?

Use "Difference Between Dates" mode: enter start and end dates. You get exact duration (years, months, days) and total day count. Check "Exclude Weekends" or "Exclude Holidays" for business-day counts.

? What are US Federal Holidays?

US Federal Holidays: New Year's Day, MLK Jr. Day, Presidents' Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, Christmas. Weekend observances follow federal rules (preceding Friday or following Monday).

? Does the calculator handle leap years?

Yes. Adding or subtracting months and years correctly handles variable month lengths and leap years (including Feb 29).
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Time & Date Reference Note

Informational Use: These tools use standard date/time algorithms and your browserโ€™s timezone data (IANA). Results are intended for general reference and planning only.

Verification Recommended: Time zone rules and daylight saving changes vary by region and year. For critical scheduling, payroll, or legal deadlines, confirm results with official sources.

Local Verification: Always confirm times, dates, and business-day counts with official sources or qualified professionals when stakes are high.

ยฉ 2026 CalcRegistry Reference Last Logic Update: FEB 2026Free Online Utility Tools