C# 2010 session variable

Question

In a C# 2010 web application, I would like to know how to convert a session variable that is in a date time format to a string value that displays in a textbox on the web application. I would like to only obtain the date part of the value.

I have tried lots of versions that look like the following:

Date1.Text = Session["Date1"].ToString("yyyy-MM-dd HH:mm:ss");

How would you setup this code so the value is acutally set correctly for the textbox?