Function durationInDays

packages/graph/src/TemporalTypes.ts:1795–1809

(start: TemporalValue, end: TemporalValue)

 * Compute the duration between two temporal values in days only.
 */
export function durationInDays(start: TemporalValue, end: TemporalValue): DurationValue | null {
  if (
    (start instanceof DateValue ||
      start instanceof LocalDateTimeValue ||
      start instanceof DateTimeValue) &&
    (end instanceof DateValue || end instanceof LocalDateTimeValue || end instanceof DateTimeValue)
  ) {
    const startDate = new Date(Date.UTC(start.year, start.month - 1, start.day));
    const endDate = new Date(Date.UTC(end.year, end.month - 1, end.day));
    const diffMs = endDate.getTime() - startDate.getTime();
    const days = Math.round(diffMs / (24 * 60 * 60 * 1000));
    return new DurationValue(0, days, 0, 0);
  }
  return null;
}

/**
 * Compute the duration between two temporal values in seconds only.