public IHttpActionResult AddWorkTime(DayTimeModel model)
        {
            if (!ModelState.IsValid)
            {
                return(InternalServerError(new Exception("Invalid model state")));
            }

            TimeSchedules newWorkTime;

            try
            {
                Users currentUser = GetUser();
                newWorkTime = ScheduleService.AddWorkingInterval(
                    currentUser.Id,
                    model.GetUtcStartDay(),
                    model.GetUtcStartTimeSpan(),
                    model.GetUtcEndtDay(),
                    model.GetUtcEndTimeSpan());
            }
            catch (Exception ex)
            {
                return(InternalServerError(ex));
            }

            return(Ok(newWorkTime));
        }