Date Calculator
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Result
0 days
(0.00 weeks)
About this Tool
This versatile Date Calculator has two modes. It can calculate the total duration (in days and weeks) between two dates, or it can calculate a future or past date by adding or subtracting a specific number of days from a starting date. Useful for planning, deadlines.
How does it work? Uses Date objects, milliseconds differences for duration, setDate for add/subtract.
- Select a mode: "Duration Between Dates" or "Add/Subtract Days".
- For Duration mode: select a Start Date and an End Date to see the time between them.
- For Add/Subtract mode: select a Start Date, choose "Add" or "Subtract", and enter the number of days to calculate the resulting date.
- Calculating age in days.
- Project deadline projections.
- Vacation duration.
- Dual modes for flexible date calculations.
- Calculates duration in both days and weeks.
- Easily add or subtract days from any given date.
- User-friendly date pickers for easy input.
Date math handles Gregorian calendar, leap years. Duration is (end - start) / 86400000 ms/day.
Leap years?
Handled automatically.
Time zones?
Local time.
Months/years add?
Days only now.
All calculations and data processing for this tool are performed locally in your browser. We do not send any of your data to our servers, ensuring your information remains private and secure.