I Believe It is not possible with SKinning Though You Can get Stuff Plug 3 If you are using 8.5 and It will add Adjustable Timezone Clocks under your display picture and the person who you are talking to Which is pretty cool if one of your friend is in another timezone So You can just edit it and see what time it is while he or she is messaging you
/ 
So You can just edit it and see what time it is while he or she is messaging you 
