Free Date Calculator - Date Math Made Easy
Add or subtract time from dates, find days between dates. Best free date calculator 2025 - essential for planning and scheduling.
Quick Answer
A date calculator helps you add/subtract days, weeks, months, or years from any date, or find the number of days between two dates. Need to know the date 90 days from today? What date was 30 days ago? Use our calculator at practicalwebtools.com for instant answers.
Key Facts about Date Calculator:
- Handles all date arithmetic: add/subtract days, weeks, months, years
- Accounts for leap years and varying month lengths
- Days between dates excludes end date (or includes, depending on preference)
- Business days calculation excludes weekends
- ISO week starts on Monday; US week typically starts Sunday
- 2024 and 2028 are leap years (February 29)
- Gregorian calendar adopted in 1582; dates before may differ
Why Use Our Date Calculator?
Complete date calculations:
Add/Subtract
Days, weeks, months, years.
Days Between
Count days between dates.
Business Days
Exclude weekends option.
Any Date
Past or future dates.
Instant Results
Get answers immediately.
100% Private
Your dates stay private.
How to Date Calculator in 3 Easy Steps
Calculate dates:
Choose Operation
Add, subtract, or find difference.
Enter Dates
Start date and duration or end date.
Get Result
See the calculated date or duration.
Master Date Math
All date calculations in one tool
Handles complex month arithmetic
Business day calculations
Essential for planning
Common Use Cases for Date Calculator
Perfect for:
Frequently Asked Questions
Everything you need to know about our date calculator
How do I add days to a date?
Enter start date and days to add - handles months and leap years.
Enter your start date and the number of days to add. The calculator handles month boundaries and leap years automatically. 30 days from Jan 15 = Feb 14.
How many days between two dates?
Enter both dates - calculator counts days, with business day option.
Enter both dates and the calculator counts days between them. Can include or exclude the end date, and optionally count only business days (Mon-Fri).
What is a business day calculation?
Counts only weekdays (Mon-Fri), skipping weekends.
Business days exclude Saturdays and Sundays. 10 business days from Friday spans about 14 calendar days.
How does adding months work?
Keeps day number, adjusts to month end if needed.
Adding months keeps the day number when possible. Jan 31 + 1 month = Feb 28 (or 29 in leap year) since Feb 31 does not exist.
Still have questions? Try the tool yourself!
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