Ruby on Rails

I have an appointment model with the appointment_time attribute which is a datetime.

My current issue is editing appointment_time with datetime_select within a form tag.

<%= datetime_select :appointment_time, @appt.appt_time,ampm: true %>


 def appt_time
 appointment_time.in_time_zone(time_zone) #this is the appointment owners time zone 
end

This gives a select with the current date and time in UTC, not the appointment date and time. appt_time does get called and returns the correct date and time adjusted for the time zone.
 

The docs mention nothing about time zones, what is the best way to accomplish this?