Date Calculator
Add or subtract time from a date, find the exact difference between dates, and calculate business-day deadlines.
Add or subtract from a date
Move a date forward or backward by calendar years, months, weeks, and days.
Find the difference between two dates
See the exact calendar gap and a practical breakdown of the elapsed days.
Calculate a business-day deadline
Count weekdays forward or backward while excluding weekends and optional holidays.
Your dates are calculated locally in your browser and are not uploaded.
How to Use the Date Calculator
Choose Add / Subtract, Date Difference, or Business Days based on the result you need.
Enter the relevant dates and time values. For business dates, add any holidays that should be skipped.
Select Calculate to see the exact result and its calendar breakdown.
Calculating a birthday?
Use the Age Calculator for exact age, birthday countdowns, and age comparisons.
Frequently Asked Questions
The total is elapsed time between the two dates, so it excludes the starting day and includes the ending date. Identical dates have a difference of zero days.
Calendar month and year adjustments preserve the day when possible. If the target month is shorter, the result uses that month's last valid day.
Monday through Friday count as business days. Saturdays, Sundays, and any valid holiday dates you enter are excluded.
No. All calculations happen locally in your browser, and the dates you enter are not uploaded.
Before You Use This Tool
A quick overview of what this page is good for, how it handles data, and what to expect before you start.
What It Does
- Add or subtract time from a date, find the exact difference between dates, and calculate business-day deadlines
Access & Privacy
You can use the main workflow without creating an account.
The core workflow is designed for fast in-browser use. Review the page inputs before pasting sensitive information.
Good Fit For
- Solve one-off browser tasks quickly.
- Get useful output without installing anything first.
- Handle small jobs directly on the page and move on.
For repeated bulk jobs or advanced automation, dedicated desktop software may still be faster.