private static IEnumerable<int> MakeRelativeScheduleWithinCutoff(BusStopRouteDaySchedule daySchedule, DateTimeOffset currentTime)
{
// Is there a better condition for this, i.e. involving a check whether there are 24hr+ time spans in the schedule?
var timeOfDay = daySchedule.Days == DaysOfWeek.NightOwl &&
currentTime.TimeOfDay.Hours < 4
? currentTime.TimeOfDay.Add(TimeSpan.FromDays(1))
: currentTime.TimeOfDay;
var scheduleCutoff = timeOfDay.Add(TimeSpan.FromMinutes(20));
return daySchedule.Times.Where(ts => ts > scheduleCutoff)
.Select(ts => (int)ts.Subtract(timeOfDay).TotalMinutes);
}