Let's say I'm in a corporate network where the NTP protocol is blocked, the BOFH^H^H^H^H sysadmins won't unblock it, and they didn't bother to set up a good internal NTP server. What's a good source that provides time via HTTP/HTTPS?

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What OS? Windows has time sync built in – Nate Koppenhaver Oct 25 '11 at 17:18
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You can use HTTP Time Protocol / htpdate. It's not a good source, not compared to NTP.
Other crazy options include connecting a GPS-receiver or using a dialup modem.

Personally I would complain about the sysadmins to your boss. Correct time is important if you want to accurately judge HTTP cache timeouts and other time-sensitive things

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