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[20170503] Adventures in Time, part 1: Interfacing an Oven Controlled Crystal Oscillator to a Computer Running NetBSD I've stumbled across this article via the Dragonfly BSD Digest: Tobias 'tnn' Nygren wrote about his aventurs in time, with part one on Interfacing an Oven Controlled Crystal Oscillator to a Computer Running NetBSD. This first article in a blog series starts by describing regular and oven ontrolled crystal oscillators, then goes on in describing the hardware setup and how it is connected to a computer. In this case, a Banana Pi running NetBSD/evbarm is used which (of course) also has its own clock. Oscilloscope measurements show differences in quality of signals and why an adapter is needed to adjust the system's clock frequency (including changes to the NetBSD kernel). In the next post Tobias will describe how to calibrate the clock with NTP. Stay tuned and have an eye on his blog! [Tags: ntp, time] [20070228] Daylight Saving Time Changes: Nothing new for NetBSD Jan Schauman has posted an announcement on the recent daylight saving time excitement: `` Daylight Saving Time (DST) was extended in a number of countries starting in 2007. For example, beginning in 2007, most of the USA will begin Daylight Saving Time at 2:00 a.m. on the second Sunday in March and revert to standard time on the first Sunday in November. While this has caused a number of software vendors a lot of headache, NetBSD has shipped with the appropriate timezone files for years; even though changes to timezones in general and DST rules in particular happen a few times a year throughout the world, the NetBSD operating system has of course always provided accurate and up to date zone files as soon as possible. The Energy Policy Act of 2005 was signed into USA law on August 8, 2005. The updated tzdata package (tzdata2005m) was imported into our source tree on August 29, 2005, and was pulled up into the netbsd-2 (September 5, 2005), netbsd-2-0 and netbsd-3 (both September 6, 2005) branches and is thus present in NetBSD 2.0.3, 2.1, 3.0, 3.0.1, 3.1 and the 4.x branches. In other words, if you're running one of these systems, no action on your part is required; your system is already prepared for the updated timezones and will continue to show the correct local time. '' You can read the full text either in his mail, or in the news item on the NetBSD website. [Tags: dst, time] [20060107] Article: Set time date on UNIX There's a blog entry (found via the #NetBSD Community Blog) thar descibes details on the Unix (and NetBSD) time handling, time zones, synchronisation and why NetBSD should be 15 seconds behind UTC. See the full text for an interesting read! [Tags: Articles, date, time]

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