Sorry it happened to you. Yes it would have been better for this institution to send a true calendar event or something that would adapt to each person's local

Sorry it happened to you. Yes it would have been better for this institution to send a true calendar event or something that would adapt to each person's local TZ. That being said, I just googled "12.00 AM" and the very first result is "12.00 AM is midnight". Pretty unambiguous. If you had never seen this notation before, being an engineer, why didn't you just look it up?