Date calculator
Standalone tool pageAdvanced Date Calculator
Add/subtract time from dates or calculate the precise difference including business days.
Output
Result
Resulting Date
Total Days
Business Days
Breakdown
How It Works
Select whether to add/subtract a duration or to find the duration between two specific dates. Use the parameters to customize the calculation, and toggle the weekend filter if you only want to measure working days.
Example
If you start at 2026-06-01 and add 10 business days, the result is 2026-06-15, which skips 4 weekend days. In 'Difference' mode, calculating between 2026-06-01 and 2026-06-15 returns 14 total days (10 business days).
Frequently Asked Questions
What is an Advanced Date Calculator?
An Advanced Date Calculator allows you to add or subtract days, weeks, months, or years from a specific date. It also computes the exact time difference (total days and working/business days) between two different dates.
How does the business day calculation work?
The business day filter automatically excludes weekends (Saturdays and Sundays) from your added count or from the elapsed days between two dates.
Can I use it to find my age or date distance?
Yes, by selecting 'Difference Between Dates', you will get a complete breakdown in years, months, and days, similar to an age calculation.
Does it support leap years?
Yes, the browser-native Date API handles leap years and variable month lengths automatically.
Is my data stored on any server?
No. This tool is completely local-first. All calculations and entries are processed within your web browser.