Date: Sat, 20 Jan 2018 01:39:50 +0000 (UTC) From: Joseph Myers <jsm@polyomino.org.uk> Subject: Re: [tz] Irish Standard Time vs Irish Summer Time | 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. I don't disagree with anything that you say, but I'd go one step further, and simply deprecate tm_isdst - it no longer serves any necessary useful purpose at all (and anyone who believes it does is not understanding its purpose). [Those who still need it for its original purpose should adopt tm_zone and tm_gmtoff instead.] We can't just delete it, as it is in C and POSIX stds, but we can tell people not to use it. kre