PHP What Timezone An Email Comes From

GaryDearing used Ask the Experts™
I have an application that reads incoming emails from an email box.  I can get the date/time the email was sent through the email header, but cannot tell which timezone the email came from so I will know that even though I received in the EDT at 9:00, to the user who sent the email, it was sent CDT 8:00.  

Does anyone know how to reliably determine which Timezone an email originated in using PHP.
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Director of Solutions Consulting
The email header should have the time in utc

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