Unit & Currency Converter

Convert a numeric value between units. Categories: length, mass, volume, area, time, temperature, energy, speed, data, pressure. Accepts canonical names ('meter', 'pound') or common aliases ('m', 'lb'). Returns {input, output, category}.

List all supported units grouped by category. Use this when you're not sure what unit names the converter accepts.

Convert an amount between currencies. Live FX from exchangerate.host (free, no key). Pass an optional ISO date for historical rates. Returns {amount, from, to, rate, date, source}.

Re-anchor an ISO datetime from one IANA timezone to another. Accepts the common timezones (UTC, America/*, Europe/*, Asia/Kolkata, Asia/Tokyo, etc.). Returns the equivalent ISO datetime in the target timezone + the offset difference in hours.

Calculate the difference between two ISO dates in the requested unit (ms / seconds / minutes / hours / days / weeks).

List supported timezones + UTC offsets.