[tz] DST offsets other than +1

2025-03-03 Thread Doug Ewell via tz
1. Are there any time zones that currently observe DST with an offset other than adding one hour? (For this question, I am treating “negative DST” zones like Europe/Dublin and Africa/Windhoek as if they observed “standard” time in winter and adjusted time in summer. Also, for this question I am

[tz] Re: DST offsets other than +1

2025-03-03 Thread Tim Parenti via tz
On Mon, 3 Mar 2025 at 17:49, Paul Gilmartin via tz wrote: > On 3/3/25 15:20, Tim Parenti via tz wrote: > > ... > > A quick visual scan of the penultimate column shows that all such SAVE > values have an absolute value of either 0 or 1:00, apart from the Troll and > LH rules as have been menti

[tz] Re: DST offsets other than +1

2025-03-03 Thread Paul Gilmartin via tz
On 3/3/25 15:20, Tim Parenti via tz wrote: ... A quick visual scan of the penultimate column shows that all such SAVE values have an absolute value of either 0 or 1:00, apart from the Troll and LH rules as have been mentioned by others as the only exceptions. . Does Ireland observe standa

[tz] Re: DST offsets other than +1

2025-03-03 Thread Paul Eggert via tz
On 3/3/25 14:20, Tim Parenti via tz wrote: Not sure if you count grep as a processor Oh, I do: cd /usr/share/zoneinfo for file in $(awk '/^[^#]/{print $3}' zone1970.tab); do echo $file $(tail -n1 $file) done | grep ' [^,]*[0-9],' On Fedora 41 this outputs: Antarctica/Troll <+00>0

[tz] Re: DST offsets other than +1

2025-03-03 Thread Jonathan Wakely via tz
On Mon, 3 Mar 2025 at 21:35, Jonathan Wakely wrote: > > On Mon, 3 Mar 2025 at 21:24, Matt Johnson-Pint via tz wrote: > > > > Yes. Australia/Lord_Howe currently has a 30-minute difference between its > > standard and daylight times. Also, Antarctica/Troll has a 2-hour > > difference. > > > > I

[tz] Re: DST offsets other than +1

2025-03-03 Thread Jonathan Wakely via tz
On Mon, 3 Mar 2025 at 21:24, Matt Johnson-Pint via tz wrote: > > Yes. Australia/Lord_Howe currently has a 30-minute difference between its > standard and daylight times. Also, Antarctica/Troll has a 2-hour difference. > > I'm not sure if there's an easy way to determine this directly from the t

[tz] Re: DST offsets other than +1

2025-03-03 Thread Tim Parenti via tz
On Mon, 3 Mar 2025 at 16:01, Doug Ewell via tz wrote: > 2. Is there an easy way I could have looked up this information in the tz > files? > > (“Easy” means without exhaustively parsing all the Rule and Zone lines, as > a processor would have to do.) > Not sure if you count grep as a processor,

[tz] Re: DST offsets other than +1

2025-03-03 Thread Matt Johnson-Pint via tz
Yes. Australia/Lord_Howe currently has a 30-minute difference between its standard and daylight times. Also, Antarctica/Troll has a 2-hour difference. I'm not sure if there's an easy way to determine this directly from the tz files, but since the data is also parsed and distributed through vario