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id_national — Validate a national identity, tax or company registration number against its country's official checksum rule. Covers 23 countries including

id_gs1 — Validate and convert GS1 identifiers: GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13), GTIN-14, GLN and SSCC. Returns the check-digit verdict, the

id_security — Validate the check digit of a financial security identifier: ISIN (ISO 6166), CUSIP, SEDOL and FIGI. Returns the verdict, the computed corre

time_zone — Convert an instant to wall-clock time in a named IANA time zone, or a wall-clock time in a zone back to an instant. Returns the local date a

time_dst — List the daylight-saving transitions for an IANA time zone over a date range: the exact instant of each shift, the offset before and after,

time_business-days — Business-day arithmetic with a caller-supplied calendar: add or subtract N working days from a date, or count the working days between two d

time_rrule — Expand an RFC 5545 recurrence rule into concrete occurrence timestamps. Accepts an RRULE string with DTSTART, an IANA time zone, and optiona

time_calendar — Convert a Gregorian date to other calendar systems and back: Islamic (both the tabular civil calendar and the Umm al-Qura variant), Hebrew,