Date Calculator
Add or subtract days, weeks, months or years from a date to land on the exact resulting day.
Reviewed by the OmniCalc teamMethod verified 2026-07-01
Friday, July 31, 2026
= 2026-07-31
Result date Friday, July 31, 2026Month and year steps clamp to the end of the month (Jan 31 + 1 month → Feb 28/29).
How to use the date calculator
- 1Pick a start date.
- 2Choose Add or Subtract, then enter an amount and a unit.
- 3Read the resulting date and its weekday.
Deadlines and reminders
Great for “90 days from signing” or “6 weeks before the event”. All arithmetic is done in UTC, so the answer never shifts with your timezone or daylight saving.
Frequently asked questions
How do I count days from today?
Set the start date to today, choose Add, enter the number of days, and read the resulting date and weekday. Choose Subtract to count backward from a date.
What happens at the end of a month?
Adding months or years clamps to the last valid day. January 31 plus one month becomes February 28 (or 29 in a leap year), because February has no 31st.
Do weekends and holidays matter?
No — this tool counts every calendar day. To count only working days between two dates, use the business days calculator instead.