/// <summary>
        /// Count days of previous absences for selected year
        /// </summary>
        /// <param name="year"></param>
        /// <param name="previousAbsences"></param>
        /// <param name="offsetFrom"></param>
        /// <param name="offsetTo"></param>
        /// <param name="overtimedAbsenceId"></param>
        /// <returns></returns>
        private double CountPrevousAbsenceDaysForSelectedYear(DateTime from, ICollection<AbsenceDTO> previousAbsences, int offsetFrom, int offsetDay,
            int overtimedAbsenceId)
        {
            if (offsetFrom == 0)
            {
                offsetFrom += 1;
            }
            if (offsetDay == 0)
            {
                offsetDay += 1;
            }
            if (offsetFrom != 1 && from.Month > offsetFrom)
            {
                from = from.AddYears(1);
            }
            var fromYear = from.Year;
            var toYear = from.Year;
            if (offsetFrom != 0)
            {
                fromYear -= 1;
            }
            int firstMonth = offsetFrom;
            int secondMonth = GetToMonth(firstMonth);
            var overtimedAbsences = previousAbsences.Where(x => x.AbsenceTypeId == overtimedAbsenceId);
            var previousAbsencesQuery = previousAbsences
                .Where(a => a.From.Year == fromYear &&
                a.From >= new DateTime(fromYear, firstMonth, offsetDay) &&
                a.To <= new DateTime(toYear, secondMonth, offsetDay) &&
                (a.State == AbsenceState.Applied || a.State == AbsenceState.Approved))
                .Except(overtimedAbsences).ToList();
            var fullDays =
                previousAbsencesQuery.Where(r => r.AbsenceLenghtDay == 1)
                    .Sum(previousAbsence => previousAbsence.Days.Count(d => d.Date.Year == fromYear));
            var halfDays =
                previousAbsencesQuery.Where(r => r.AbsenceLenghtDay == 0.5)
                    .Sum(previousAbsence => previousAbsence.Days.Count(d => d.Date.Year == fromYear));
            var sum = halfDays * 0.5 + fullDays;
            return sum;
        }