Add (or subtract) a duration to a date. duration like "2d", "-3h", "1w 2d", "90m". Returns the resulting UTC ISO timestamp.

Compute a precise age (years, months, days) from a birth date to today (or a given date), plus total days.

Convert meters to light years (length). Pass ?value=N.

Validate a UUID and report its version (1-8) and variant. Accepts hyphenated or braced forms.

Convert meters to micrometers (length). Pass ?value=N.

Convert meters to millimeters (length). Pass ?value=N.

Convert meters to nanometers (length). Pass ?value=N.

Score a password's strength: character-set size, entropy bits, a 0–4 rating, and an estimated offline crack time. The password is never stored or logged.

Count business days (Mon–Fri) between two dates, inclusive of the start, exclusive of the end. Optional list of holiday dates to skip.

Convert kilometers to meters (length). Pass ?value=N.

Convert meters to astronomical units (length). Pass ?value=N.

Resolve an RFC 6901 JSON Pointer (e.g. /items/0/name) against a JSON value. Returns the value or found:false.

Convert meters to centimeters (length). Pass ?value=N.

Convert kilometers to nanometers (length). Pass ?value=N.

Convert kilometers to centimeters (length). Pass ?value=N.

Convert kilometers to micrometers (length). Pass ?value=N.

Validate an ISBN-10 or ISBN-13 checksum (hyphens/spaces ignored) and report which format it is.

Convert meters to furlongs (length). Pass ?value=N.

Convert kilometers to millimeters (length). Pass ?value=N.

Convert meters to kilometers (length). Pass ?value=N.