After time elapses, the display format changes.
Currently your post is showing as "Yesterday, 01:12" . As it ages, the display will change to "__ Days Ago" "One Week Ago" "One Month Ago" etc...
In a perfect world, it would probably save & store posts in MMDDYY 24H time format. Having it the present way can create some headaches/ambiguity doing historical research...