Data properties from API different from start_date/end_date

Is it possible to use different data format properties then the ones that come default (start_date, end_date)?
My properties coming from my API are:
AppointmentTimeSlotStartTime
AppointmentTimeSlotEndTime

Hi,

start_date and end_date are mandatory properties. docs.dhtmlx.com/scheduler/loadi … properties
You can add any custom ones, but task start and end dates render according to default ones.

Thank you for the timely response.