Date Calculator
Add or subtract any amount of time to a date and get the resulting date and weekday.
Runs 100% in your browser — nothing is uploaded.
Result
Formula
Add calendar months first (day clamped to month end), then whole days.
About this calculator
The UTIQO Date Calculator adds or subtracts a specified amount of time—years, months, weeks, and days—to or from a given start date, returning the resulting calendar date and its weekday. The calculation starts from the given start date.
How to use
- 1
Pick a start date.
- 2
Enter years, months, weeks and/or days.
- 3
Choose add or subtract.
Frequently asked questions
What happens if I add months to a date like January 31?
The calculator clamps the day to the last valid day of the target month. For example, adding 1 month to January 31 gives February 28 (or 29 in a leap year).
Does the calculator account for leap years?
Yes, the calendar arithmetic automatically accounts for leap years when determining the number of days in February and the total number of days in a year.
Can I subtract dates instead of adding?
Yes, choose 'Subtract' as the direction. The calculator will subtract the specified years, months, weeks, and days from the start date.
Please note: Results are estimates for general information only and are not professional or medical/financial advice.