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The value of TextBox1 is 10:24:23 AM and the value of TextBox2 is 11:32:54 AM.

I am trying to compute the time in VB.NET and I tried this code;

Dim a As Date
Dim b As Date
Dim c As Date

a = TextBox1.Text
b = TextBox2.Text

c = (a - b)

MessageBox.Show(Format(c, "hh:mm:ss"))

But I encounter the error: Operator '-' is not defined for types 'Date' and 'Date'

What's the best thing to do?