Construct a full ISO 8601 datetime string from separate date, time, and timezone.
Replaces the per-park getXxxOffset() helpers that every park reimplemented.
Parameters
dateStr: string
Date in YYYY-MM-DD format
timeStr: string
Time in HH:mm or HH:mm:ss format
tz: string
IANA timezone name (e.g., 'Europe/Amsterdam', 'America/New_York')
Returns string
ISO 8601 string with correct timezone offset (e.g., '2024-07-15T10:00:00+02:00')
Construct a full ISO 8601 datetime string from separate date, time, and timezone. Replaces the per-park getXxxOffset() helpers that every park reimplemented.