Calculating difference between years

by Andy
Posted on January 10, 2013December 28, 2015

I needed to create a dropdown list that had all the years back to a certain date. To accomplish this I would need to calculate difference between years back to the specified date. This isn’t really a difficult but here is the code just incase anyone else needs to do the same.

Here is how I did it:

DateTime dtStartYear = new DateTime(2010, 1, 1);
DateTime dtThisYear = DateTime.Now;

int iYearDiff = (dtThisYear.Year - dtStartYear.Year);

for(int i = 0; i <=iYearDiff; i++)
{
     string strTemp = DateTime.Now.AddYears(-i).Year.ToString();
     ListItem li = new ListItem(strTemp, strTemp);
     ddlYear.Items.Add(li);
}

DateTime dtStartYear = new DateTime(2010, 1, 1);

DateTime dtThisYear = DateTime.Now;

int iYearDiff = (dtThisYear.Year - dtStartYear.Year);

for(int i = 0; i <=iYearDiff; i++)

{

string strTemp = DateTime.Now.AddYears(-i).Year.ToString();

ListItem li = new ListItem(strTemp, strTemp);

ddlYear.Items.Add(li);

}

Pretty simple right? Not sure if there is a better way, but this seems to give me what I needed.