Yes it work 
Step 1:
So, I miss to manually change dconf at dconf at /org/mate/panel/objects/clock/prefs/ format from 24 hours to custom
Step 2:
Than change it dconf at /org/mate/panel/objects/clock/prefs/ custom-format to %a %H:%M %m/%d/%Y
and the result to panel clock: format change immediately after I press enter at dconf custom-format
Thank you very much 