Function nextWindowStart

src/node/updater/MaintenanceWindow.ts:95–105

(now: Date, window: MaintenanceWindow)

 * collapse to `now`. Fire-now is gated by `inWindow`, not this function.
 */
export const nextWindowStart = (now: Date, window: MaintenanceWindow): Date => {
  const s = toMinutes(window.start);
  if (s == null) return now;
  const isUtc = window.tz === 'utc';
  const year = isUtc ? now.getUTCFullYear() : now.getFullYear();
  const month = isUtc ? now.getUTCMonth() : now.getMonth();
  const day = isUtc ? now.getUTCDate() : now.getDate();
  const todayStart = buildAt(year, month, day, s, window.tz);
  if (todayStart.getTime() > now.getTime()) return todayStart;
  return buildAt(year, month, day + 1, s, window.tz);
};