It would be rather useful to have information on how inaccurate people’s clocks are. Some security protocols, such as OCSP certificate revocation checking, can (in some circumstances or configurations) be affected by how accurate the user’s clock is.
This means that if 90% of the Internet is going around with clocks which are several hours out, the protocol in that configuration would be more insecure than if everyone’s clock was accurate to the nearest second. So it would be nice to have a chart of number of users against inaccuracy.
One could measure this info reasonably easy on a web page – just call
new Date().toGMTString() and send it back to a server which is connected to an accurate clock. Does anyone know of a source of such data? Ideally, it would be from a website whose visitors were a cross-section of the Internet population.