(Go) Get the Email Received Date/Time

Get's the date/time from the topmost Received header. The date/time of when you received an email may be different than the date/time stored in the Date header field, which if truthful, is the date when the email was sent.

The Received header field will look something like this:

Received: from mail.example.com (mail.example.com [99.255.255.99])
 by inbound-smtp.us-west-2.amazonaws.com with SMTP id 72ma443vs1g0o6vqd8erojkpss35s0dt32h323o1
 for admin@chilkatsoft.com;
 Wed, 25 Jul 2018 08:04:23 +0000 (UTC)

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    email := chilkat.NewEmail()

    success := email.LoadEml("qa_data/eml/p.eml")
    if success != true {
        fmt.Println(email.LastErrorText())
        email.DisposeEmail()
        return
    }

    sb := chilkat.NewStringBuilder()
    sb.Append(*email.GetHeaderField("Received"))

    // Replace semicolons with CRLF's
    numReplaced := sb.Replace(";","\r\n")

    st := chilkat.NewStringTable()
    st.AppendFromSb(sb)

    if st.Count() == 0 {
        fmt.Println("Should have at least one line..")
        email.DisposeEmail()
        sb.DisposeStringBuilder()
        st.DisposeStringTable()
        return
    }

    // The date/time string is the last line in the string table.
    sb.SetString(*st.StringAt(st.Count() - 1))
    sb.Trim()

    fmt.Println("Received date/time = ", *sb.GetAsString())

    email.DisposeEmail()
    sb.DisposeStringBuilder()
    st.DisposeStringTable()