12 Hours clock in Exchange after migration

Hi,
We have migrated from Exchange 2010 to Exchange 2013.
After migration the declined meeting request show their answere in 12 Hours clock.
Servers and Clients have all 24 hours clock.
How is it possible to change that?
Your request was declined because there are conflicts.
The conflicts are:
Organizer and Time of Conflicting Meeting
Testuser - fredag, januar 16, 2015 1:00:00 to fredag, januar 16, 2015 2:30:00
All times listed are in the following time zone: (UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna

Hi Tech,
Base on my knowledge, the time formats of this message will follow the system time format.
If your system time format is 12 hours clock, the message will be the same.
In addition, 12 hours clock will include "AM" & "PM" words, however there are no these words in your message.
I recommend you check your system time format again, the following screenshot for your reference:
Best regards,
Niko Cheng
TechNet Community Support

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