Not sure if you can, and why would you?
Any PHP script can query the server for time & date.
Looking at the logs would give you an estimate of the time also.
But as a suggestion/what we do.
I have all the servers set to Zulu/UTC.
But we also have servers in the US, and 3 other countries. (Shameless plug, the overseas servers are mirror server we run)
Even before that though, I set them to Zulu, because it's just easier. You might have support on Eastern Time (US), a web designer in Europe somewhere, and the client down under in Australia.