The time zone we use is UTC, which is the universal standard and we always use the 24h format. If you have sent an email at 10:30h UTC on April 27, it's the same as if you have sent it at 12:30h UTC+2, which is the time zone of Spain at the moment.
In the audit trail you will also see the complete date in UTC, the time zone, and you can always convert it to local time very easily with any time converter: https://www.timeanddate.com/worldclock/converter.html
We cannot change this for certification reasons and because all of our customers have to have the same time and time zone. I also confirm that this is perfectly legal and you will not have any problem.