Add or subtract N business days from a date, skipping weekends and your holiday list, WORKDAY style.

Split a week of daily hours into regular, overtime and double time using your daily and weekly thresholds.

Count business days between two dates, skipping weekends and your holiday list, NETWORKDAYS style.

List the vehicle models NHTSA records for a make in a given model year, optionally filtered by vehicle type.

Look up the manufacturer, make and vehicle type behind a 3-character VIN prefix (WMI), with region and country.

List the vehicle types (car, truck, motorcycle, MPV) NHTSA records for a make, separating exact make matches from look-alikes.

Validate a VIN: 17 characters, no I/O/Q, and the position-9 check digit per 49 CFR 565, with the expected digit.

Split a VIN into manufacturer code, descriptor and serial parts with region, country and model-year candidates.

Decode a VIN with NHTSA vPIC: make, model, year, trim, body, engine, plant and decoder warnings, with a check-digit cross-check.

Parse, sum and format ISO 8601 durations (PT36H, P1Y2M10DT2H30M), or turn seconds into ISO and clock form.

Age or tenure between two dates in years, months and days, plus total days, next anniversary and decimal years.

Look up an SPDX license id: name, OSI and FSF status, deprecated flag, links, and plain-language permissions and duties.

Plain-language checklist for a license: what you may do, what you must do when you distribute, and what is disclaimed.

Livestock feed needed per day and for a period from head count, body weight, dry-matter intake, feed moisture and waste.

Fertilizer product rate and total needed to hit a target N, P2O5 or K2O rate, and all nutrients it supplies.

Total hours from clock-in/out pairs with unpaid break deduction, optional rounding, per-day totals and overlap flags.

Validate an SPDX license expression (AND, OR, WITH, +): syntax, known ids, known exceptions and deprecated identifiers.

Classify up to 30 license ids by strength: public-domain-like, permissive, weak copyleft, strong copyleft or network copyleft.

Working hours between two timestamps under a weekly schedule with breaks and a holiday list.

Check a list of license ids against SPDX: current, deprecated or unknown, with the modern GNU -only / -or-later form.