From b6a8aeca928debd8853b94a6307f5f0e03c51e27 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Wed, 30 Mar 2022 11:28:59 -0700 Subject: [PROPOSED] Improve Morocco 2087 rearguard workaround * ziguard.awk: In the Morocco rearguard workaround, add a day of "DST" on 2087-05-11, switching to standard time (without changing the UTC offset) the next day. The idea is to work around a problem with the DST offset finding logic on Android. Problem reported by Almaz Mingaleev. --- ziguard.awk | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/ziguard.awk b/ziguard.awk index 2be6d52..6856a49 100644 --- a/ziguard.awk +++ b/ziguard.awk @@ -104,7 +104,11 @@ DATAFORM != "main" { } if (!vanguard && $1 == "Rule" && $2 == "Morocco" && 2019 <= $3) { if ($9 == "0") { - last_std_date = $3 " " $6 " " $7 " " $8 + # Add a day, to insert an extra transition to work around a bug + # in Android's DST offset finding logic circa 2022. See: + # https://mm.icann.org/pipermail/tz/2022-March/031352.html + # This does not affect the UTC offset, only the DST flag for that day. + last_std_date = $3 " " $6 " " ($7 + 1) " " $8 sub(/\t0\t/, "\t1:00\t") } else { sub(/\t-1:00\t/, "\t0\t") -- 2.35.1