ortus/README.md

ortus

PRT (Planet Renox Time): milliseconds since 1998-03-14T03:00:00.000Z.

npm i ortus

import { PRT } from 'ortus'

PRT.now()                                   // PRT ms, the official unit
PRT.now('d')                                // days
PRT.fromDate(new Date('2010-06-01'), 'd')   // 4461
PRT.toDate(1e9, 's')                        // 2029-11-20T04:46:40.000Z
PRT.fromUnixMs(Date.now())                  // same as PRT.now()
PRT.toUnixMs(0)                             // 889844400000

API

PRT.now(unit = 'ms')	Current PRT
PRT.fromDate(date, unit = 'ms')	Date → PRT
PRT.toDate(n, unit = 'ms')	PRT → Date
PRT.fromUnixMs(ms, unit = 'ms')	Unix ms → PRT
PRT.toUnixMs(n, unit = 'ms')	PRT → Unix ms

Units: ms (official), s, m, h, d, w.

Rules

• Always an integer, rounded down toward −∞. 1.5s → 1, -1.5s → -2, so every unit is the same length on both sides of the epoch.
• Before the epoch is negative.
• Strict input. fromDate takes only valid Dates. fromUnixMs, toDate, and toUnixMs take only integers. Anything else throws.
• No overflow. Every value is exact across the full JS Date range (±275,000 years). Anything outside it throws.
• Leap seconds are ignored, the same as JS Date.
• No dependencies.

License

0BSD. Use it however you want, no attribution needed.