So I've polished indicator-applet package to improve independent "DateTime" indicator applet to put it into center pack on gnome-panel looks like WingPanel!
So we could put datetime indicator into gnome-panel anywhere you want. And then actually it seems quite good than original embedded clock applet...
Yeah it's very similar to wingpanel's appearances so far!! Wow!! I've also updated my Selene theming to accept for the new look of Calendar appearance...
If you had been interesting in "Centre Clocked" gnome-panel, And if you like wingpanel's centre clock, please give it a try:
(Remember this ppa is only for precise testing.. lol)
sudo apt-add-repository ppa:tista/selene
sudo apt-get update
sudo apt-get install indicator-applet indicator-applet-datetime indicator-applet-session indicator-applet-appmenu indicator-applet-complete