asp.net small example of counting days by date

  • 2020-05-30 19:51:03
  • OfStack


// Calculate number of days  
    protected int getDays(DateTime date1, DateTime date2) 
    { 

        int days = 0; 
        if (date1.Year == date2.Year) 
        { 
            if (date1.Month < date2.Month) 
            { 
                days = (date2.Day - date1.Day) + (date2.Month - date1.Month) * 30; 
            } 
            if (date2.Month == date1.Month) 
            { 
                days = date2.Day - date1.Day; 
            } 
        } 
        else
        { 
            DateTime date3 = Convert.ToDateTime(date1.Year + "- 12 - 31"); 
            DateTime date4 = Convert.ToDateTime(date2.Year + "- 01 - 01"); 
            int day1 = 0; 
            if (date1.Month < date3.Month) 
            { 
                day1 = (date3.Day - date1.Day) + (date3.Month - date1.Month) * 30; 
            } 
            if (date3.Month == date1.Month) 
            { 
                day1 = date3.Day - date1.Day; 
            } 

  

            int day2 = 0; 
            if (date4.Month < date2.Month) 
            { 
                day2 = (date2.Day - date4.Day) + (date2.Month - date4.Month) * 30; 
            } 
            if (date4.Month == date2.Month) 
            { 
                day2 = date2.Day - date4.Day; 
            } 

            days = day1 + day2; 

        } 
        return days; 
    } 


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