Advanced Age Calculator

Privacy: Client-side only

Birth date & time

Timezone Local (detected) UTC +00:00 Asia/Kolkata (UTC+05:30) America/New_York (UTC-04:00) Europe/London (UTC+01:00) Asia/Tokyo (UTC+09:00) Custom offset

Target date/time (leave blank = now)

Show Y/M/D Y/M/D H:M:S Totals (days/hours/...)

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Advanced outputs & tools

Planetary ages (years)

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Upcoming milestones

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Quick presets

Common inputs

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Fractional & totals

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Settings

Account for leap seconds (approx) Show planetary ages

Privacy

All calculations happen in your browser. Nothing is sent to a server unless you export or share.

Built for privacy-first, client-side use. Features: exact age, timezone offsets, target-date, totals, planetary ages, milestones, JSON/CSV export, .ics export for next birthday.