[tz] Irish Standard Time vs Irish Summer Time

Brian Inglis Brian.Inglis at SystematicSw.ab.ca
Sat Jan 20 06:21:09 UTC 2018

On 2018-01-19 22:01, Guy Harris wrote:
> On Jan 19, 2018, at 8:10 PM, Christos Zoulas <christos at zoulas.com> wrote:
>> Also if we are changing tm_zone, then tm_gmtoff should be an int not a
>> long.
> Same binary-compatibility problem, at least on LP64 platforms.
>> Does anyone remember why it was chosen to be a long? 16 bit integers
>> on pdp 11? Does "struct tm" go that far back?
> struct tm goes all the way back to, at minimum, V7, which definitely ran on
> PDP-11's.
> tm_zone doesn't go back as far, and the PDP-11 may not have been a concern
> at that point, but there may have still have been ILP16 or I16LP32 platforms
> at the time.

PCs pre 68K and pre 386 protected mode DOS "extenders".

Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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