I added the below snippet to my manager class, however, when sending the email, it takes the server datetime. The server is in a different country whereas we are sending email to German customers. Any suggestions would be helpful! Thank you!

 SMTPMessage emailMessage = new SMTPMessage(outboundEmailHandler.getSession());
              // Set the Date header to German or UK date format depending on template code
                if(emailTemplate.getTemplateCd().contains("_DE")) {
                    SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.GERMAN); //April 8 2024 = Mo., 08 Apr 2024 14:30:45 GMT+00:00
                    emailMessage.setHeader("Date", dateFormat.format(new Date()));
                } else if(emailTemplate.getTemplateCd().contains("_UK")) {
                    SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.UK); //April 8 2024 = Mon, 08 Apr 2024 14:30:45 GMT
     
                    emailMessage.setHeader("Date", dateFormat.format(new Date()));
                }
    // #4 build the Sender Content from the template from Address data
                emailMessage = buildSenderContent(emailMessage,emailTemplate.getFromAddress(), emailTemplate.getReturnPath());
                
            // #5 Set recipient, subject, and return (envelopeFrom) fields
            emailMessage.setRecipients(Message.RecipientType.TO,emailAddress);
            emailMessage.setSubject(emailTemplate.getSubject());
            emailMessage.setEnvelopeFrom(emailTemplate.getReturnPath());
            
            // #6 Set the body text, don't set characterset of plain/text as it is unsupported
            bodyPartText.setText(emailTemplate.getEmailText());
            multiPart.addBodyPart(bodyPartText);
            
            // #7 If we have HTML formatted text, set character set defaults and add it to the multiPart
            if (!(StringUtils.isBlank(emailTemplate.getEmailHtml()))) {
                bodyPartHTML.setContent(emailTemplate.getEmailHtml(), CustomerNotificationsConstants.HTML_CONTENT_CHARACTERSET);
                multiPart.addBodyPart(bodyPartHTML);
            }
            
            // #8 if we have an attachment, add that s well
            if (!(StringUtils.isBlank(attachment))) {
                multiPart.addBodyPart(createAttachmentBodyPart(attachment));
            }
            // #9 Set the final content we've built for the multi part message
            emailMessage.setContent(multiPart);
            
            return emailMessage;