Calculate exact calendar age, total elapsed days, and time until the next birthday.
Times use your browser’s local time zone. Leave either time at 00:00 for a date-focused result.
Planning estimate only, not financial, tax, or legal advice. Verify assumptions and current rules before making decisions.
This tool runs completely in your browser. No data is transmitted, stored, or logged.
Keep this calculator handy. Inputs and results are not included in shared links unless you add them yourself.
Calendar age subtracts complete years, then complete months, then remaining days; total days uses UTC date boundaries to avoid daylight-saving shifts.
Sources support the method, terminology, or planning context. Editable assumptions remain your responsibility.
Privacy: Inputs and results stay in this browser. Results are planning estimates, not professional advice.