Nested IF statement help

Under my button click event, I have several if statements. I'm having trouble with the evaluation of the passwordLastSet. Even if it has been more than 24 hours, it goes directly to the else statement that the password has been set less than 24 hours ago.

Cheers,
Brendan

protected void btnSubmit_Click(object sender, EventArgs e)
        {
            System.Guid guid = Guid.NewGuid();
            logInfo.IPaddress = "need to add IP address method";
            if (txtUser.Text != string.Empty)
            {
                string username = txtUser.Text.ToString();

                if (DateTime.Now.Subtract(passwordLastSet).TotalHours < 24)
                {
                    if (UserExists(FindName(username)))
                    {
                        logInfo.userName = txtUser.Text.ToString();
                        logInfo.TrackingID = guid;
                        logInfo.requestType = "Request Password";
                        logInfo.email = eMailAddress.ToString();
                        logInfo.InsertRequest();


                        lblStatus.Text = "all is good";

                    }
                    else
                    {
                        lblStatus.Text = "The user does not exists";
                        logInfo.errorType = lblError.Text.ToString();
                        logInfo.userName = txtUser.Text.ToString();
                        logInfo.TrackingID = guid;
                        logInfo.InsertRequestError();
                    }
                    // return a message that the time since last reset has been less than 24 hours
                }
                else
                {
                    lblStatus.Text = "the time has been less than 24 hours";
                }
                    
                
            }
        }

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