Can Finder show dates including seconds?
Nothing has changed, except that the location within System Preference has had a name change.

You can do this as follows:


Got to Apple > System Preferences...
Select the Language &amp; Region preference pane
Click the Advanced... button at bottom left
Select the Times tab
You'll see the Short format fields at top
Edit this field by dragging the 'Second' time element from the Time Elements area to the Short field (Note: You'll need to manually enter the colon (:) in between the mins and secs if you was it to be displayed as well)
Click on OK
Exit System Preferences


Now you'll have the seconds displayed in your Finder time stamps.