@kahi-ui/framework/util/datetime/datetimestamps.js

Straight-forward Svelte UI for the Web

import { Temporal } from "../../vendor/js-temporal-polyfill";
const EXPRESSION_INSTANT = /Z$/;
const EXPRESSION_OFFSET = /[\+\-]\d\d:\d\d$/;
const EXPRESSION_TIMEZONE = /\[[\w/]+\]$/;
export function from_datetimestamp(datetimestamp, modify) {
    if (typeof datetimestamp === "number") {
        return Temporal.Instant.fromEpochMilliseconds(datetimestamp);
    }
    else if (EXPRESSION_OFFSET.test(datetimestamp) || EXPRESSION_INSTANT.test(datetimestamp)) {
        return Temporal.Instant.from(datetimestamp);
    }
    else if (EXPRESSION_TIMEZONE.test(datetimestamp)) {
        return modify
            ? Temporal.ZonedDateTime.from(datetimestamp).with(modify)
            : Temporal.ZonedDateTime.from(datetimestamp);
    }
    return modify
        ? Temporal.PlainDateTime.from(datetimestamp).with(modify)
        : Temporal.PlainDateTime.from(datetimestamp);
}
export function to_datetimestamp(datetimestamp, modify) {
    if (datetimestamp instanceof Temporal.Instant)
        return datetimestamp.toString();
    else if (datetimestamp instanceof Temporal.ZonedDateTime)
        return modify
            ? datetimestamp
                .withCalendar("iso8601")
                .with(modify)
                .toString({ calendarName: "never", timeZoneName: "never" })
            : datetimestamp
                .withCalendar("iso8601")
                .toString({ calendarName: "never", timeZoneName: "never" });
    return modify
        ? datetimestamp.withCalendar("iso8601").with(modify).toString({ calendarName: "never" })
        : datetimestamp.withCalendar("iso8601").toString({ calendarName: "never" });
}