Does the tool use my local time zone?

Yes. Date calculations follow your device’s local time zone. Results may differ if your time zone changes.

Is this the same as official age rules in my country?

Not always. Countries and institutions may define age differently for eligibility. This tool is for reference; verify official rules for legal or financial use.

How is “days between” calculated?

It computes whole-day differences between midnight dates in your local time zone. You can include or exclude the end date.

Does ONDO store my dates?

No. Inputs are processed locally. If you share a link, your settings may be encoded in the URL.

Age & Date Calculator | Age in Years, Months, Days + Days Between + Countdown

Age

Enter your birth date and an optional “as of” date.

Birth date

As of (optional)

Age (years)

—

Years / Months / Days

—

Total days (approx.)

—

Next birthday in

—

How to use

Choose a tab: Age, Days Between, or Countdown.
Pick dates (optional dates let you simulate “as of” / “today”).
Use Copy result or Share to send the same settings.

Notes

This tool uses your device’s local time zone. Results can differ across time zones.
“Months” are shown as an approximation (days ÷ 30.4375) for quick reference.
Official eligibility rules (school, insurance, benefits) may define age differently.

Privacy & disclaimer

Local-only: Calculations run in your browser. ONDO does not require accounts. If you use “share,” dates may be included in the URL. Avoid sharing sensitive info.

Read disclaimer

Results are for reference only and may not match official definitions.
Do not use as a sole source for legal/financial eligibility decisions.
Verify with official documents or providers if required.

FAQ

Why do results change in a different time zone?

Dates are interpreted in your device’s local time zone. Midnight boundaries can shift with time zones.

Can I bookmark a calculation?

Yes. Use “Copy link” or “Share” to create a URL that reproduces your settings.

Does ONDO store my birth date?

No. Inputs are processed locally. If you share a URL, the dates may appear in the link.