Add seconds to taskbar clock?

Much appreciate all the replies!

My superficial understanding was based on the fact I assumed the OS based time on that which was derived from the clock itself. It does stand to reason though that there is actually an "internal" clock which self-synchronizes from which the tray clock is getting queues, not vise verse. I envisioned 3rd party clocks as complete replacements of the Windows clock thus removing that ability. Great to know my understanding was clouded and not the facts.

I intend to give all the suggested utilities a try on a like Win7-64 system before deciding on one for the more critical install.

Stephanie -- I was hopeful that tweak would be successful but alas it seems the option has been eliminated.

how about this one? :

TimeLeft - FREE countdown, reminder, clock, alarm clock, tray clock, stopwatch, timer, sticker, auction watch and time synchronization utility.

Currently it's not possible to make Windows 7 taskbar clock display the seconds without 3rd party app.

However, 7+ Taskbar Tweaker from 7+ Taskbar Tweaker - RaMMicHaeL's Blog adds this functionality with one single click:

I did actually imagine it that way: