Function zonedDateTimeToUtcIso

zonedDateTimeToUtcIso(
    dateStr: string,
    timeStr: string,
    timeZone: string,
): string
Converts a wall-clock date and time in an IANA timezone to a UTC ISO 8601 string.
Parameters
- dateStr: string
  Calendar date (YYYY-MM-DD).
- timeStr: string
  Clock time (HH:MM).
- timeZone: string
  IANA timezone name.
Returns string
UTC ISO 8601 timestamp.

Throws
When the wall-clock date/time does not exist in timeZone (for example a DST gap).
- Defined in lib/youtube-schedule.ts:103