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Hi @G_B, welcome to our forum!
As @Viridis mentioned, if you set the phone to show 24-hour format all alarms will be shown in the same format.
If you for example set an alarm while the phone is in 12-hour mode (AM/PM) in the clock application to ring at 2.00 PM and you then switch back to 24-hour format the alarm time will change to 14.00.
You can not have 24-hour format enabled in the phone and have alarms shown as AM and PM.
Let us know if we misunderstood your question!
Correct: if 12h mode, it shows 2pm; if 24h mode it shows 2 not 14 (after being saved, in all alarms screen; when setting it up it shows 14). On home screen and lock screen it shows correctly.
Hello again and thanks for the swift reply!
Now I understand what you mean and I was able to replicate this behaviour on an Xperia XA.
The alarm times are indeed shown in 12-hour format in the application even when the phone is set to 24-hour format.
I'm very thankful to both of you for raising this question and I will make sure to forward this internally as user feedback.
I wish you both a great day! 
No problem at all.
Let me know if there is anything else I can assist you with! 