How To Record Login Time For Users

Since you tagged your question as VB.Net, I understand that you dont need a T-SQL query to answer your question.

I dont know in which point you had difficulty though;
Your steps as follows;

Create a table with the fields of , ID, UserID, UserName, LoginTime if you need you can link this table with your Users table and use UseriD as a foreign key.

In your login page. Connect to your DB, and make a insert query to the specified table. Something like

Try
        Mycn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=[your db].mdb;")
        Mycn.Open()
        SQLstr = "INSERT INTO Table1 (field1, field2,field3) VALUES('" & TextBox1.Text & "','" & TextBox2.Text & "','" & TextBox3.Text & "')"
        Command = New OleDbCommand(SQLstr, Mycn)
        icount = Command.ExecuteNonQuery
        MessageBox.Show(icount)
    Catch ex As Exception
        MsgBox(ex)
        Mycn.Close()
    End Try