Click Start-Settings-Control Panel-Regional and Language Options-Customize-Time-Time Format.
H:mm:ss in 1 and (t) is preceded by two tts.
Such as ttH:mm:ss
If you want your name to be displayed at the back of the time, you can enter tt at the back.
Such as: H:mm:sstt
Then write your name in the AM symbol (M).
Write your name in the PM symbol (P).
4. Click Apply/OK to finish. Refresh on the screen, your name will be before the time in the lower right corner.
Ps: XP can be found in Control Panel-Date, Time, Language and Regional Settings-Regional and Language Options-Regional Options-Custom-Time.