Age
Calculator
Years, months and days.
Open the age calculator →
Date & Time
Date Calculator
Add or subtract days, weeks, months or years from a date to get the resulting date and weekday.
Result date
—
The calculated date.
| Day of week | — |
|---|---|
| Days from start | — |
| Start date | — |
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Enter your figures above to see the step-by-step working.
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How the Date Calculator Works
Add or subtract a number of days, weeks, months or years from any date and this calculator returns the resulting calendar date, along with the day of the week and how many days it is from where you started. It handles the awkward parts — month lengths, leap years, year rollovers — automatically.
Days and weeks shift by a fixed number of days; months and years shift the calendar fields, so “one month after January 31” lands sensibly at the end of February. Useful for due dates, deadlines, notice periods and reminders.
result = start ± amount × unit
Frequently Asked Questions
What date is X days from today?
Enter today’s date, choose Add, type the number of days and pick “days.” The calculator returns the exact date and its day of the week.
How are months and years added?
By shifting the calendar month or year and keeping the day of the month where possible. If the target month is shorter, the date rolls to the nearest valid day, which is standard date arithmetic.
Can I subtract time to find a past date?
Yes — choose Subtract to count backwards, for example to find when a notice period must start before a deadline.
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