Buck said:

NTP will speed up the clock (or slow it down)
a bit until the incoming packets match the system clock. In other
words, the clock will gradually slew onto the new time. With SNTP, the
algorithm is simple, and doesn't slew the clock, it makes up the
difference in one jump, so there's a lurch when SNTP needs to make a

I was going to ask the question "does NTP slew the clock on a DST event?"
and, while composing this, SWAGed that the question was irrelevant.

What NTP and SNTP do is based on UTC and has nothing to do with a time zone
change, which is what a DST event actually is.

Am I right?

Waiting with a worm on my tongue . . .

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