Function getFormattedHour

core/src/components/datetime/utils/format.ts:105–136

(hour: number, hourCycle: DatetimeHourCycle)

 * hour 0 is formatted as '12'.
 */
export const getFormattedHour = (hour: number, hourCycle: DatetimeHourCycle): string => {
  /**
   * Midnight for h11 starts at 0:00am
   * Midnight for h12 starts at 12:00am
   * Midnight for h23 starts at 00:00
   * Midnight for h24 starts at 24:00
   */
  if (hour === 0) {
    switch (hourCycle) {
      case 'h11':
        return '0';
      case 'h12':
        return '12';
      case 'h23':
        return '00';
      case 'h24':
        return '24';
      default:
        throw new Error(`Invalid hour cycle "${hourCycle}"`);
    }
  }

  const use24Hour = is24Hour(hourCycle);
  /**
   * h23 and h24 use 24 hour times.
   */
  if (use24Hour) {
    return addTimePadding(hour);
  }

  return hour.toString();
};

/**
 * Generates an aria-label to be read by screen readers