ACR_Time.ACR_Time.DaysUntilStartOfMonth C# (CSharp) Method

        public int DaysUntilStartOfMonth(int currentMonth, int currentYear)
        {
            if (currentMonth == 1) return 0;

            int retValue = 31;
            if (currentMonth >= 3)
            {
                retValue += 28;
                if (GetIsLeapYear(currentYear)) retValue++;
            }
            else if (currentMonth >= 4) retValue += 31;
            else if (currentMonth >= 5) retValue += 30;
            else if (currentMonth >= 6) retValue += 31;
            else if (currentMonth >= 7) retValue += 30;
            else if (currentMonth >= 8) retValue += 31;
            else if (currentMonth >= 9) retValue += 31;
            else if (currentMonth >= 10) retValue += 30;
            else if (currentMonth >= 11) retValue += 31;
            else if (currentMonth >= 12) retValue += 30;

            return retValue;
        }