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My alarm clock is old and has an auto daylight savings feature that doesn't seem to work anymore. So last week I switched the timezone to make the time read correctly.

Today it switched for daylight savings.

@ted

The clock may be hard wired with the legislated dates of DST from the era when it was made.

Since then, for some reason VERY CLEAR to those who voted, DST dates were changed.

Please, give me standard time all year long!

@Algot probably not the whole story because the original dates were on the weekends as well. So switching on a Thursday shows a different error.

@ted

Could Thursday's date have been on a weekend back then?

(I agree, it no longer matters, of course. It's just fun to wonder about the algorithm embedded in your clock's silicon.)

@ted

Contemplating such oddities is brain stretching activity for us who are old people.

@ted why would we ever change when we did dst? Thought the dev.

@Greg I never realized how complex the whole thing is until I worked for an operating system vendor.

Most devs can just ask the OS and get a reliable answer about DST. It's a pain, but there are libraries and data files shipped with the OS.

The reality is that some countries change when DST is on a yearly basis, and some not until it is very close to the switch over. The dates depend on who is in power politically (and which holidays they care to avoid).

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