[Mailman-Developers] Date normalization - opinions sought

Does Mailman normalize dates on emails to UTC?

It seems like a good idea to me to normalise dates on emails to UTC but you guys would know best.

What would be the pros and cons of email date normalisation to UTC? Are there good reasons not to?

Which date field on an email is even the right one to use? Sent date or received date? And WHICH received date , because there can be various dates can’t there?

thanks

as