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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
If you're on a Windows domain, this isn't an option. – Fiasco Labs Jun 17 '13 at 22:08
up vote 4 down vote accepted

Link in the accepted answer is dead. Try this one:

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You can use HTTP Time Protocol / htpdate. It's not a good source, not compared to NTP.
Other 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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Not if you're a member of a Windows domain. You have issues with Kerberos if you start playing Goofy. They just need to get off their combined situpons and enable the PDC to get NTP updates.. – Fiasco Labs Jun 17 '13 at 22:07

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