Date Calculator

Calculate days between two dates or add/subtract days from a date. Shows business days excluding weekends.
Mode

Days Between

2

calendar days

Weeks

0.3

Months

0.1

Years

0.01

Date Difference

Calendar Days2
Business Days0
Weeks0.3
Months (approx)0.1
Years (approx)0.01

Use the Date Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Our Date Calculator allows you to quickly determine the number of days between two specified dates, or to add/subtract a specific number of days from a starting date. This is incredibly useful for project planning, calculating deadlines, or understanding timeframes, especially when considering only business days. For instance, if you start a 30-business-day project on January 1st, 2026, knowing the exact end date without manually counting weekends is crucial.

The core methodology involves iterating through the days between the start and end dates (or adding/subtracting sequentially) and incrementing a counter. For business day calculations, each day is checked to see if it falls on a Saturday or Sunday, and if so, it is excluded from the count. This ensures an accurate tally of only working days, providing a realistic timeframe for tasks.

A common mistake is forgetting to account for holidays when planning business days; this calculator only excludes weekends, not public holidays. Always double-check your local holiday calendar to adjust your final date if necessary. Also, be mindful of how date ranges are interpreted – some calculations include both the start and end date, while others only one.

Example: Project Deadline Calculation in 2026

  1. 1 A new product launch in 2026 requires a 45-business-day development phase starting on February 10th, 2026.
  2. 2 Using the calculator, input 'February 10, 2026' as the start date and 'Add 45 business days'. The calculator processes the dates, skipping Saturdays and Sundays.
  3. 3 The calculator determines that 45 business days from February 10th, 2026, lands on April 14th, 2026.
  4. 4 This means the development team needs to complete their tasks by April 14th, 2026, to meet the launch schedule, assuming no additional public holidays impact the timeline.

Source: TimeAndDate · Last updated: April 2026

Frequently Asked Questions

How do I calculate business days between two dates?
Count all weekdays (Monday through Friday) between the two dates, excluding Saturdays and Sundays. Optionally exclude federal holidays. Most businesses use this for shipping, payment, and deadline calculations.
How many days are between two dates?
Subtract the earlier date from the later date. Remember that months have different lengths (28-31 days). Online date calculators handle leap years and varying month lengths automatically.
How many business days are in a year?
There are typically 260-262 weekdays in a year. After subtracting 10-11 federal holidays, most US workers have about 250-252 business days per year.

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