Monday, 5. March 2007
PermaLink Daylight Savings Time and NTP03/05/2007 11:48 AM
Some out there are under the impression that NTP will resolve their DST issues. This is not the case. This is a quote from Cisco:

Network Time Protocol Implications

Although it might appear that the use of Network Time Protocol (NTP) will avert any issues related to these time changes, NTP and Daylight Saving Time are mutually exclusive and one does not help or hinder the other. The Network Time Protocol is a utility used to synchronize clocks on different devices. Typically, NTP takes a reference clock from a source that is based on the Coordinated Universal Time (UTC), which does not change regardless of DST.

For example, the Eastern Standard Time (EST) in the United States is five hours behind the UTC time when Daylight Saving Time is not active. EST is four hours behind when Daylight Saving Time is active. DST configuration is very specific to the time zone in which the device is deployed, and the NTP UTC is used as a reference when DST is calculated on each individual device.


More info for Cisco related products can be found here.

I have post topics piling up. I was hoping to post these on my new blog, which will be hosted at a new domain, but time is in short supply currently.
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