diff 498f4f15b500e3e85f26bd884478698579745fd7 uncommitted
--- a/adm/timezone/Australia_South
+++ b/adm/timezone/Australia_South
@@ -1,12 +1,24 @@
-CST 34200 CDT 37800
-1538836200 1554568200
-1570293000 1586017800
-1601742600 1617467400
-1633192200 1648917000
-1664641800 1680366600
-1696091400 1712421000
-1728145800 1743870600
-1759595400 1775320200
-1791045000 1806769800
-1822494600 1838219400
-1853944200 1869669000
+CST 34200 CST 37800
+  57722400   68608800   89172000  100058400  120621600  131508000
+ 152071200  162957600  183520800  195012000  215575200  226461600
+ 247024800  257911200  278474400  289360800  309924000  320810400
+ 341373600  352260000  372823200  384314400  404877600  415764000
+ 436327200  447213600  467776800  478663200  499226400  511322400
+ 530676000  542772000  562125600  574826400  594180000  606276000
+ 625629600  638330400  657079200  667965600  688528800  701229600
+ 719978400  731469600  752032800  764733600  783482400  794368800
+ 814932000  827632800  846381600  857268000  877831200  890532000
+ 909280800  920772000  941335200  954036000  972784800  983671200
+1004234400 1016935200 1035684000 1046570400 1067133600 1080439200
+1099188000 1110074400 1130637600 1143338400 1162087200 1172973600
+1193536800 1206237600 1224986400 1235872800 1256436000 1269741600
+1288490400 1299376800 1319940000 1332640800 1351389600 1362276000
+1382839200 1395540000 1414288800 1425175200 1445738400 1459044000
+1477792800 1488679200 1509242400 1521943200 1540692000 1551578400
+1572141600 1584842400 1603591200 1615082400 1635645600 1648346400
+1667095200 1677981600 1698544800 1711245600 1729994400 1740880800
+1761444000 1774144800 1792893600 1804384800 1824948000 1837648800
+1856397600 1867284000 1887847200 1900548000 1919296800 1930183200
+1950746400 1964052000 1982800800 1993687200 2014250400 2026951200
+2045700000 2056586400 2077149600 2089850400 2108599200 2119485600
+2140048800
--- a/sys/src/cmd/test/date.rc
+++ b/sys/src/cmd/test/date.rc
@@ -7,12 +7,12 @@
 '
 
 fn check {
-	r=`$nl{../$O.seconds $1}
-	if(! ~ $r $2){
+	r=`$nl{../$O.$1 $2}
+	if(! ~ $r $3){
 		echo "$"r"
-		echo "$"2"
+		echo "$"3"
 		echo $status
-		>[1=2] echo fail: $1: got $r expected $2
+		>[1=2] echo fail: $1 $2: got $r expected $3
 		exit 'fail'
 	}
 }
@@ -19,16 +19,16 @@
 
 # examples from manpage, and shuffles
 rfork ne
-check '23 may 2011' 			1306108800
-check 'may 23 2011' 			1306108800
-check 'may 2011 23' 			1306108800
-check '23 2011 may' 			1306108800
-check '2011 may 23'			1306108800
-check '2011 23 may'			1306108800
+check seconds '23 may 2011' 			1306108800
+check seconds 'may 23 2011' 			1306108800
+check seconds 'may 2011 23' 			1306108800
+check seconds '23 2011 may' 			1306108800
+check seconds '2011 may 23'			1306108800
+check seconds '2011 23 may'			1306108800
 
 # now with timezones
-check '23 may 2011 edt'			1306123200
-check '23 may 2011 gmt'			1306108800
+check seconds '23 may 2011 edt'			1306123200
+check seconds '23 may 2011 gmt'			1306108800
 
 # If the tz is present, the results should stay
 # the same if we change zones.
@@ -35,35 +35,47 @@
 @{
 	rfork en
 	cat /adm/timezone/US_Pacific >/env/timezone
-	check '23 may 2011 edt'			1306123200
-	check '23 may 2011 gmt'			1306108800
+	check seconds '23 may 2011 edt'			1306123200
+	check seconds '23 may 2011 gmt'			1306108800
 }
 
 # now with all variations on times.
-check 'may 23 2011 0'			1306108800
-check 'may 23 2011 0:1'			1306108860
-check 'may 23 2011 0:1:2'		1306108862
+check seconds 'may 23 2011 0'			1306108800
+check seconds 'may 23 2011 0:1'			1306108860
+check seconds 'may 23 2011 0:1:2'		1306108862
 
 # now with times and timezones
-check '23 may 2011 edt'			1306123200
-check '23 may 2011 gmt'			1306108800
+check seconds '23 may 2011 edt'			1306123200
+check seconds '23 may 2011 gmt'			1306108800
 
 # formats from ../$O.date(1)
-check 'Sun, 14 Jun 2020 22:08:48 -0700'	1592197728
-check 'Sun, 14 Jun 2020 -0700'		1592118000
-check '2020-06-14'			1592092800
-check '2020-06-14T22:14:17-07:00'	1592198057
+check seconds 'Sun, 14 Jun 2020 22:08:48 -0700'	1592197728
+check seconds 'Sun, 14 Jun 2020 -0700'		1592118000
+check seconds '2020-06-14'			1592092800
+check seconds '2020-06-14T22:14:17-07:00'	1592198057
 
 # colloquial american format (eww)
-check '06/14/2020'			1592092800
-check '06/01/2020'			1590969600
+check seconds '06/14/2020'			1592092800
+check seconds '06/01/2020'			1590969600
 
+# Do we transition at the right DST?
+@{
+	rfork en
+	cat /adm/timezone/US_Eastern >/env/timezone
+	check date 1710053999 'Sun Mar 10 01:59:59 EST 2024'
+	check date 1710054000 'Sun Mar 10 02:00:00 EST 2024'
+	check date 1710054001 'Sun Mar 10 03:00:01 EDT 2024'
 
+	check date 1730617200 'Sun Nov  3 03:00:00 EDT 2024'
+	check date 1730617201 'Sun Nov  3 02:00:01 EST 2024'
+	check date 1730620800 'Sun Nov  3 03:00:00 EST 2024'
+}
+
 # Arizona has no DST
 @{
 	rfork en
 	cat /adm/timezone/US_Arizona >/env/timezone
-	check 'Mon, Jun 21 17:38:02 MST 2020' 1592786282
+	check seconds 'Mon, Jun 21 17:38:02 MST 2020' 1592786282
 }
 
 # CET is a timezone with no hard-coded
--- a/sys/src/libc/port/date.c
+++ b/sys/src/libc/port/date.c
@@ -254,6 +254,8 @@
 		tm->tzoff = 0;
 		return;
 	}
+	/* stupidity -- the transitions are in local time */
+	abs += tz->stdiff;
 	for(p = tz->dlpairs; *p; p += 2)
 		if(abs > p[0] && abs <= p[1]){
 			dl = 1;