qwe

var calendarItems = avHelper.GetVirtualAvailabilityForDay(vp.AvailabilityData, duration, month, dayOfWeek);

                if (calendarItems.Count > 0)
                {
                    var firstVPAvailabilityEntry = calendarItems.First();
                    var fHour = firstVPAvailabilityEntry.Start.Hour;
                    var fMinute = firstVPAvailabilityEntry.Start.Minute;

                    var lastVPAvailabilityEntry = calendarItems.Last();
                    var eHour = lastVPAvailabilityEntry.End.Hour;
                    var eMinute = lastVPAvailabilityEntry.End.Minute;

                    var s = datePart.AddHours(fHour).AddMinutes(fMinute);
                    var e = datePart.AddHours(eHour).AddMinutes(eMinute).Add(duration);

                    var result = Client.Views.VirtualProductSchedules.GetPossibleStartDateTimesUtc(vpId, s, e, presets);

                    possibleTimes.AddRange(result);
                }