@burglekitt/gmt/dist/plain/calculate/roundTime.js

Temporal-based date and time utilities with timezone support and polyfill integration

import { Temporal } from "@js-temporal/polyfill";
import { isValidTime, isValidTimeUnit } from "../validate/index.js";
/**
 * Round an ISO 8601 time string to the specified time unit.
 *
 * - Returns "" for invalid inputs.
 * - Only time units are accepted: "hour", "minute", "second", "millisecond", "microsecond", "nanosecond".
 * - Wraps Temporal.PlainTime.round() which throws on invalid options.
 *
 * @param value ISO 8601 time string
 * @param options Rounding options: smallestUnit, optional roundingIncrement and roundingMode
 * @returns Rounded ISO 8601 time string, or "" on invalid input
 *
 * @example roundTime("12:34:56", { smallestUnit: "hour" }) // "13:00:00"
 * @example roundTime("12:34:56", { smallestUnit: "minute" }) // "12:35:00"
 * @example roundTime("12:34:56", { smallestUnit: "second", roundingMode: "floor" }) // "12:34:56"
 * @example roundTime("invalid", { smallestUnit: "hour" }) // ""
 */
export function roundTime(value, options) {
    const { smallestUnit, roundingIncrement, roundingMode } = options;
    if (!isValidTime(value) || !isValidTimeUnit(smallestUnit))
        return "";
    try {
        const source = Temporal.PlainTime.from(value);
        const result = source.round({
            smallestUnit,
            roundingIncrement,
            roundingMode,
        });
        // Handle default precision: 0 for > sec, 3 for ms, 6 for µs, 9 for ns
        const precisionMap = {
            millisecond: 3,
            microsecond: 6,
            nanosecond: 9,
        };
        const fractionalDigits = precisionMap[smallestUnit] || 0;
        return result.toString({ fractionalSecondDigits: fractionalDigits });
    }
    catch {
        return "";
    }
}