SOLVED!
Installed ubuntu MATE 18 and it’s awesome, but ubuntu and MATE18 both being new to me, I cannot locate where to change time from 24 format to 12 hour format. I found where to adjust date and time but don’t see 24 to 12 option.
(MATE18 runs better on my HP Pavilion than standard ubuntu18 which doesn’t allow cutNpaste nor word correction with touch pad lower right corner tap.)