Can I change the calendar format to 24-hr format?

I have it the system settings set to 24hr, but the calendar still shows AM/PM in eM Client. Is there any way I can fix this?
Thanks in advance!

The only way how to do that is to change “Regional settings” to a country which supports 24h format by default.

eM Client does not display time in 24 hr. format even though rest of my windows applications display time in 24 hr. format since my regional setting is set for HH:mm:ss.