If you want to query an NTP time source without having to set your computer to synchronise with the time source, you can do so using the W32TM command in command prompt.
w32tm /stripchart /computer:[DNS or IP ADDRESS] /dataonly /samples:5
External Time Sources
In Australia, a good reliable time source to use is 0.au.pool.ntp.org.
Check out the NTP Project for world wide time sources.