[tz] Irish Standard Time vs Irish Summer Time
Joseph Myers
jsm at polyomino.org.uk
Sat Jan 20 01:39:50 UTC 2018
On Fri, 19 Jan 2018, Robert Elz wrote:
> "Standard" time is simply the time that is agreed it is *now* (at any
> time of the year) - that's what it means to be a standard.
That's essentially why I think tm_isdst should be based on something other
than the notion of one time offset being standard and another being a
variant on that. The laws establishing time offsets have the function of
determining the offset applicable for legal purposes at any given time,
not the function of determining tm_isdst. Just because the law happens to
be worded as "the offset is X, except at these times when it's Y", or to
give a name involving "standard time" to one choice of offset, should not
be considered of semantic significance; the law had to choose some part of
the year to be X and some part to be Y, or if naming the offsets had to
come up with different names for them, but the particular choice of which
is X and which is Y is just an arbitrary choice in drafting the law.
--
Joseph S. Myers
jsm at polyomino.org.uk
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