I am having the same problem. However: the way I configured it, is I modified calendar.js in magicmirror/modules/default/calendar. There is a setting in that file timeformat:. It was set to relative and I modified it to absolute.
Can someone please clarify if this is the proper way to configure this or does something have to be changed in config.js too?
My calendar is still relative right now.
Thanks!
Nathan