I have a client with a PHP form that uses the sendmail function. The date reported on the sent email is 13 hours prior to the actual date, which can be seen since the text of the email contains the date and time.
They are using their internal Exchange Server.
The date / time and locale is correct on the web server and Exchange Server.
Email sent via Outlook from the web server is dated correctly, which is why I am posting this in the PHP directory.