Function: formatDtm()

formatDtm(parts): string

Reconstruct the HL7 DTM string from DtmParts. The inverse of parseDtm for a strict HL7 parse: formatDtm(parseDtm(s)) === s for any well-formed s, including the byte-preserving -0000 (which HL7, unlike RFC 3339, treats as UTC but whose sign we retain for exact round-trip). Returns the raw string unchanged when parts.valid is false.

Emits exactly the populated precision, no zero-fill, so a year-only value re-serializes to four characters, never YYYY0101.

Parameters

parts

DtmParts

Returns

string

Example

import { parseDtm, formatDtm } from "@cosyte/hl7";
formatDtm(parseDtm("198807050000")); // "198807050000"
formatDtm(parseDtm("1970"));         // "1970"