Hours of the day , Time major cities

http://www.timeanddate.com/worldclock/

GMT Timestamp and Universal Time links

GMT Server Time Stamp and
Your Computer Clock Time

Copy from HERE**

Click this Link Ø UTC

to get Current GMT in a new, blank window

Click this Link Ø Your Computer Clock

to also get Current UTC and Your Computer Clock Time in a new, blank window

** to here if you want to insert in your stuff.

If the difference is greater than 2 seconds you should synchronise your PC clock manually