This is primarily for Windows 7, but I work in multiple versions and would happy to be able to do it in as many of them as possible. Currently, when I open Explorer and look at a list of files, the date modified column shows something like:
09/18/2013 10:03
I would like it to display:
09/18/2013 10:03:42
I've tried changing the region and language settings for the short time format from HH:mm to HH:mm:ss, but it says it ignores seconds for that. Does that mean I'm just out of luck? And again, I'd like to be able to do this in any other previous versions of Windows too. It's useful for me as a developer to be able to see the seconds in a lot of situations.
Minor clarification: I did find this question and answer, which helped me to improve the file properties display, but I wanted to be able to view the full timestamp for all the files in a folder at once, instead of individually.

forfilesanswer, but it's not convenient because the results aren't formatted or sortable. – Joe M Sep 18 '13 at 16:26ssfrom the time format string even if the user is manually asking for it??? If I don't want the seconds to show, I can remove it from the string myself! – ADTC Oct 28 '13 at 06:51