Omnipus

Date calculator — add days or count days between dates

Runs on your deviceFreeNo account

How to use Date calculator

In Add / subtract, pick a start date, choose Add or Subtract, and enter years, months, weeks, or days (or tap a quick button like 90 days). In Days between dates, pick two dates and optionally include the end date.

1

Open the tool

Use the workspace below — no signup is required.

2

Enter your input

In Add / subtract, pick a start date, choose Add or Subtract, and enter years, months, weeks, or days (or tap a quick button like 90 days). In Days between dates, pick two dates and optionally include the end date.

3

Copy the result

Copy text or download a file when the tool offers an export. Local tools keep processing in this tab.

Direct share: Install Omnipus as an app on Android to share files and links into this tool from other apps.

About this tool

Two calculators in one. Add or subtract years, months, weeks, and days from any date (with an optional Mon–Fri business-day mode), or count the days between two dates as total days, weeks and days, years-months-days, and weekdays. Public holidays are not excluded because they vary by country. Uses date-fns in your browser.

#date calculator#days from today#90 days from today#add days to date#days between dates

Related guides

Frequently Asked Questions

What is 90 days from today?

Open the Add / subtract tab — it starts on today’s date with 90 days filled in, and shows the result with the weekday.

Does it skip holidays?

No. Business-day mode skips Saturdays and Sundays only. Holidays differ by country and region.

What happens when adding a month to 31 January?

You get the last day of February (28 or 29), because February has no 31st.

Should I include the end date?

Tick it when both the first and last day count, for example a hotel stay counted in days rather than nights.

Is Date calculator completely free to use?

Yes. Date calculator on Omnipus is free to use with no subscription paywall for the tool itself.

Are my files or data uploaded to any servers?

No. Date calculator processes your input locally in this browser tab. Your files and text are not sent to Omnipus. Some tools download an engine or model file the first time you use them; that is a download, not an upload.

Can I use Date calculator on my mobile phone?

Yes. Omnipus has touch-friendly controls and can be installed as an app. On Android you can also share files or links into tools from other apps.

Related tools

More calculators that pair well with this one.

Date differenceDays, weeks, and months between two dates.Days untilCountdown in days to a target date.Age calculatorFind exact age in years, months, and days from a date of birth.Hours calculatorAdd start and end times with unpaid breaks and get total hours in h:mm and decimal.