Upvote:3
Gayot Fow's answer is, as usual, correct, but he has neglected to call attention to a critical flaw in your reasoning.
You are under the impression that you will be spending 28 days and 30 minutes in the Schengen area, but under the Schengen rules, that is not the case. There is no such thing as a "minute" under these rules. That is to say, a 28-day visa does not authorize a stay of 672 hours.
Rather, the stay is calculated based on calendar days. The total number of hours for a 28-day stay can therefore be anywhere between 624 hours and 672 hours.
The day on which you enter the area counts as one day, and the day on which you leave counts as one day. That is, if you arrive at 23h30 and leave 60 minutes later, that counts as a two-day stay. If you arrive at 00h30 and leave 23 hours later, that counts as a one-day stay. The stay you have outlined, therefore, counts as a 29 day stay.
The manner of counting days is important because, under your reasoning, you would be able to solve your problem by arranging to leave 30 or more minutes earlier than your current itinerary states. But, in fact, you need to leave at least 18 hours and 30 minutes earlier; that is, before midnight. (Or, you could delay your arrival by at least 6 hours, until after midnight.)
Upvote:5
You should change your ticket. Schengen officials expect the person to regulate their affairs in such a way that these types of questions are not necessary. When you applied for the visa you satisfied them that you would be out and gone by midnight on the 28th day and they expect you to be prudent enough to back off of that deadline so that the vicissitudes of travelling are accounted for. So naturally they will be disappointed, even if you are in breach for only part of a day.
It is unlikely that you will be fined on exit but you risk seeing a future Schengen application refused with the reason "The information submitted regarding justification for the purpose and conditions of the intended stay was not reliable." They would select this reason if they thought that the information you submitted previously turned out to be unreliable.