OK .. it's a bit tricky, but not too difficult.
(1) Go to your post with the time you want to get
(2) On the top of the post is a line of text that reads "Posted x hours ago" .. place your cursor on this text and get the exact date time structure that shows on popup box .. ex: "02/21/2019 12:05 PM" was mine.
(3) Right click on the post and select "View Page Source" .. this will show the source code for the whole page (don't get too worried about the code)
(4) Click on the code and do a "search" for the date-time you just grabbed above.. this will place you in the area of your exact post, with the time code. (May be other similar posts, but just click the arrow up/down on search to view them). In my pic below the SEARCH box is on the bottom of my browser window .. that's where the date-time goes. Then just search.
(5) Your time will show up to the second when you've located that segment code.