Revert "Fix date being used in mail packets, timezone was effectively being to a timestamp with the timezone already"

This function is used to get the true date of a message (taking into account the TZ), and needed when creating the TZUTC

This reverts commit ad0ad73b0c.

app/Notifications/Netmails/EchoareaNotSubscribed.php

@@ -53,7 +53,7 @@ class EchoareaNotSubscribed extends Netmails
 				$this->mo->msgid,
 				$this->mo->to,
 				Carbon::now()->utc()->toDateTimeString(),
-				$this->mo->datetime->utc()->toDateTimeString(),
+				$this->mo->date->utc()->toDateTimeString(),
 			)
 		);