The interweb does not operate at the speed of light re; latency.
In the U S of A your tax dollars support the Bureau of Standards; the final ultimate say of "what time is it".
They broadcast every second of every day of every week of every month of every year for your listening pleasure on 2.5 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz. . The best time to listen is when they broadcast a leap second.
Let us not hold our breath waiting for Swiss watchmakers to put that into the ultra high end perpetual calendar watches. They can't even do daylight savings time; my two hundred dollar Casio can easily do daylight savings time as well as any leap second the Bureau decides to add.
Good news for mechanical watch owners; no leap second in 2010.
P.S. So you guys rely on digital timing to set your analog master pieces; your secret is safe with me.
P.P.S. the official time for the U S of A is
http://www.time.gov. It may not be correct but it is the legal time and that is what counts in a court of law.