Date Calculator
Calculate the duration between two dates, count business days, or find the target date by adding or subtracting years, months, or days.
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Calculations are based on the standard Gregorian calendar. This is useful for tracking project milestones, legal deadlines, and personal anniversaries.
How to use
- 1
Choose a mode: 'Difference Between Dates' or 'Add/Subtract Time'.
- 2
Enter the start date and end date (for difference) or a single start date (for add/subtract).
- 3
If adding/subtracting, enter the number of years, months, and days you wish to move.
- 4
Select whether to include or exclude the end date in the final count.
- 5
Review the result to see the total days, weeks, and months.
Formula
The duration is calculated by subtracting the start date from the end date. For 'Add/Subtract' modes:
Frequently asked questions
What is the difference between calendar days and business days?
Calendar days include every day of the week (Monday-Sunday). Business days typically exclude weekends (Saturday and Sunday). This calculator currently provides both the total calendar duration and business days.
Does this tool account for leap years?
Yes. The calculator uses the Gregorian calendar system, which automatically accounts for the extra day in February during leap years (e.g., 2024, 2028).
How can I calculate a 90-day warranty or contract deadline?
Use the 'Add/Subtract Time' mode. Enter your start date, type '90' in the days field, and set the operation to 'Add'. The tool will give you the exact expiration date.