PRT (Planet Renox Time): ms since 1998-03-14T03:00:00Z

Zero-dependency ESM package with types. now, fromDate, toDate,
fromUnixMs, toUnixMs; units ms|s|m|h|d|w, floored toward -Infinity,
exact across the full JS Date range. 0BSD.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

index.d.ts

@@ -0,0 +1,17 @@
+/** PRT units: milliseconds (official), seconds, minutes, hours, days, weeks */
+export type Unit = 'ms' | 's' | 'm' | 'h' | 'd' | 'w'
+
+export declare const PRT: Readonly<{
+  /** Current PRT, rounded down. Defaults to ms. */
+  now(unit?: Unit): number
+  /** PRT at the given Date, rounded down. Defaults to ms. */
+  fromDate(date: Date, unit?: Unit): number
+  /** Date at the given integer PRT value. Defaults to ms. */
+  toDate(value: number, unit?: Unit): Date
+  /** PRT at the given integer Unix ms, rounded down. Defaults to ms. */
+  fromUnixMs(unixMs: number, unit?: Unit): number
+  /** Unix ms at the given integer PRT value. Defaults to ms. */
+  toUnixMs(value: number, unit?: Unit): number
+}>
+
+export default PRT