Date Calculator
Add or subtract days from a date and get the resulting date.
Quick answer: enter your details below and click Calculate Date — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Enter the start date as YYYY-MM-DD.
- Enter how many days to move.
- Choose add or subtract and click Calculate Date.
About this tool
Enter a start date, a number of days, and a direction, and the tool returns the resulting date and the day of the week. Date maths is easy to get wrong by one, especially across months, so the tool counts in whole days from midnight UTC.
Frequently asked questions
Can I subtract days too?
Yes. Choose subtract and the tool moves backwards by the same number of days.
Does it show the day of the week?
Yes. The result includes the weekday, which is often the real reason for the calculation.