Return the transition code in effect at datetime.
Return the transition code associated with the latest transition that occurs on or before the specified datetime in this timetable. If this timetable has no such transition, return initialTransitionCode(). The behavior is undefined unless 24 > datetime.hour() and datetime.date() is within the valid range of this timetable.
transition code in effect at datetime
| Name | Description |
|---|---|
| datetime | datetime to query |