After editing numerous “pyo” files in “usr/lib/enigma2/python” :
The first page of Multi EPG shows correct am/pm time.
My modified Skin generates the correct am/pm time too.
The rest remains in 24h format like “Add Timer and single EPG. This is due to missing EPG configuration files in Openpli; Vix have them, (correct me if I am wrong). The developers of Openpli can create them if there is a demand, it’s always good to have a choice. We have to wait.
And if you play with your satellite receiver, always make a full backup, very important. I have backups with the original 24h format and with the modifications I made.
Thanks to all of you that tried to help me.