Function roundTime

src/util/time.ts:453–469

(date: Date, timeUnit: PrimaryTimeUnit, isUTC: boolean)

 * @return The input date.
 */
export function roundTime(date: Date, timeUnit: PrimaryTimeUnit, isUTC: boolean): Date {
    switch (timeUnit) {
        case 'year':
            date[monthSetterName(isUTC)](0);
        case 'month':
            date[dateSetterName(isUTC)](1);
        case 'day':
            date[hoursSetterName(isUTC)](0);
        case 'hour':
            date[minutesSetterName(isUTC)](0);
        case 'minute':
            date[secondsSetterName(isUTC)](0);
        case 'second':
            date[millisecondsSetterName(isUTC)](0);
    }
    return date;
}

export function fullYearGetterName(isUTC: boolean) {
    return isUTC ? 'getUTCFullYear' : 'getFullYear';