Calculate Years and Months Between Dates Using C# and Javascript

C# Code

public string CalculateTenure(DateTime Hday, DateTime Cday)

{

 int Years = 0; int Months = 0;

 if ((Cday.Year - Hday.Year) > 0 || (((Cday.Year - Hday.Year) == 0) && ((Hday.Month <              Cday.Month) || ((Hday.Month == Cday.Month) && (Hday.Day <= Cday.Day)))))

{

 int DaysInHdayMonth = DateTime.DaysInMonth(Hday.Year, Hday.Month);

 int DaysRemain = Cday.Day + (DaysInHdayMonth - Hday.Day);

 if (Cday.Month > Hday.Month)

  {

   Years = Cday.Year - Hday.Year;

   Months = Cday.Month - (Hday.Month + 1) + Math.Abs(DaysRemain / DaysInHdayMonth);

  }

  else if (Cday.Month == Hday.Month)

  {

   if (Cday.Day >= Hday.Day)

   {

    Years = Cday.Year - Hday.Year;

    Months = 0;

   }

   else

   {

    Years = (Cday.Year - 1) - Hday.Year;

    Months = 11;

   }

  }

  else

  {

   Years = (Cday.Year - 1) - Hday.Year;

   Months = Cday.Month + (11 - Hday.Month) + Math.Abs(DaysRemain / DaysInHdayMonth);

  }

 }

 return Years + " Year(s) " + Months + " Month(s)";

}

  

Javascript Code 

function CalculateTenure(Hday, Cday) {

       var Years = ''; var Months = '';

       var HdayDate = new Date(Hday);

       var CdayDate = new Date(Cday);

       var HdayDateYear = HdayDate.getFullYear();

       var HdayDateMonth = HdayDate.getMonth() + 1;

       var HdayDateDay = HdayDate.getDate();

       var CdayDateYear = CdayDate.getFullYear()

       var CdayDateMonth = CdayDate.getMonth() + 1;

       var CdayDateDay = CdayDate.getDate();

if ((CdayDateYear - HdayDateYear) > 0 || (((CdayDateYear - HdayDateYear) == 0) && ((HdayDateMonth < CdayDateMonth) || ((HdayDateMonth == CdayDateMonth) && (HdayDateDay <= CdayDateDay)))))

{

  var DaysInHdayMonth = new Date(HdayDateYear, HdayDateMonth, 0).getDate();

  var DaysRemain = CdayDateDay + (DaysInHdayMonth - HdayDateDay);

  if (CdayDateMonth > HdayDateMonth)

  {

   Years = CdayDateYear - HdayDateYear;

   Months = CdayDateMonth - (HdayDateMonth + 1) + Math.floor(DaysRemain / DaysInHdayMonth);

  }

  else if (CdayDateMonth == HdayDateMonth)

  {

   if (CdayDateDay >= HdayDateDay)

   {

    Years = CdayDateYear - HdayDateYear;

    Months = 0;

   }

   else

   {

    Years = (CdayDateYear - 1) - HdayDateYear;

    Months = 11;

   }

  }

  else

  {

   Years = (CdayDateYear - 1) - HdayDateYear;

   Months = CdayDateMonth + (11 - HdayDateMonth) + Math.floor(DaysRemain / DaysInHdayMonth);

  }

 }

 return Years + " Year(s) " + Months + " Month(s)";

}