vremel/dist/datetime/_startOfTimeForZonedDateTime.js

JavaScript date utility library for Temporal API

/** @internal */
export function startOfTimeForZonedDateTime(zdt, withArg) {
    const [earlier, later] = ["earlier", "later"].map((disambiguation) => zdt.with(withArg, {
        offset: "ignore",
        disambiguation,
    }));
    if (earlier.toPlainDateTime().equals(later.toPlainDateTime())) {
        // backward transition or no transition
        return earlier;
    }
    else {
        // forward transition
        const start = earlier.getTimeZoneTransition("next");
        if (start === null) {
            throw new Error("Unknown error");
        }
        return start;
    }
}
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