create time duration using c#

Here are the code I created for that purpose:

private string calculateLastUpdate(DateTime dt1, DateTime dt2)

{

string strTimeValue = "";

string timespans;

string[] arrTimespan;

TimeSpan ts = dt1.Subtract(dt2);

timespans = ts.ToString().Replace(":", ".");

if (timespans.Substring(0, 8) == "00.00.00")

timespans = timespans.Substring(9, timespans.Length - 10);

else if (timespans.Substring(0, 5) == "00.00")

timespans = timespans.Substring(6, timespans.Length - 10);

else if (timespans.Substring(0, 2) == "00")

timespans = timespans.Substring(3, timespans.Length - 10);

arrTimespan = timespans.Split('.');

strTimeValue = getTimeUnit(arrTimespan.Count(), Convert.ToInt32(arrTimespan[0]));

return strTimeValue;

}

private string getTimeUnit(int position, int value)

{

string result = "";

switch (position)

{

case 5: result= "day";

if (value / 365 >= 1)

{

result = "year";

value = value / 365;

}

else if (value / 30 >= 1)

{

result = "month";

value = value / 30;

}

else if (value / 7 >= 1)

{

result = "week";

value = value / 7;

}

break;

case 4: result = "hour"; break;

case 3: result = "minute"; break;

case 2: result = "second"; break;

case 1: result = "milisecond"; break;

}

if (value > 1)

result += "s";

result = Convert.ToString(value) + " " + result + " ago";

return result;

}

hope its usefull :)