From 9ee975c8c8e562243af687aedf8cba7797a56b54 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Sat, 6 Jun 2020 21:22:18 +0000
Subject: (cherry-pick): Update TZ info to tzdata2020a.

---
 library/tzdata/Africa/Casablanca  |  24 ++--
 library/tzdata/Africa/El_Aaiun    |  24 ++--
 library/tzdata/America/Dawson     | 161 +------------------------
 library/tzdata/America/Godthab    | 247 +-------------------------------------
 library/tzdata/America/Nuuk       | 246 +++++++++++++++++++++++++++++++++++++
 library/tzdata/America/Whitehorse | 161 +------------------------
 library/tzdata/Asia/Shanghai      |   2 +
 7 files changed, 277 insertions(+), 588 deletions(-)
 create mode 100644 library/tzdata/America/Nuuk

diff --git a/library/tzdata/Africa/Casablanca b/library/tzdata/Africa/Casablanca
index 99027c9..05ae49f 100644
--- a/library/tzdata/Africa/Casablanca
+++ b/library/tzdata/Africa/Casablanca
@@ -60,7 +60,7 @@ set TZData(:Africa/Casablanca) {
     {1557021600 0 1 +01}
     {1560045600 3600 0 +01}
     {1587261600 0 1 +01}
-    {1590285600 3600 0 +01}
+    {1590890400 3600 0 +01}
     {1618106400 0 1 +01}
     {1621130400 3600 0 +01}
     {1648346400 0 1 +01}
@@ -76,7 +76,7 @@ set TZData(:Africa/Casablanca) {
     {1801965600 0 1 +01}
     {1804989600 3600 0 +01}
     {1832205600 0 1 +01}
-    {1835229600 3600 0 +01}
+    {1835834400 3600 0 +01}
     {1863050400 0 1 +01}
     {1866074400 3600 0 +01}
     {1893290400 0 1 +01}
@@ -92,7 +92,7 @@ set TZData(:Africa/Casablanca) {
     {2046304800 0 1 +01}
     {2049933600 3600 0 +01}
     {2077149600 0 1 +01}
-    {2080173600 3600 0 +01}
+    {2080778400 3600 0 +01}
     {2107994400 0 1 +01}
     {2111018400 3600 0 +01}
     {2138234400 0 1 +01}
@@ -108,7 +108,7 @@ set TZData(:Africa/Casablanca) {
     {2291248800 0 1 +01}
     {2294877600 3600 0 +01}
     {2322093600 0 1 +01}
-    {2325117600 3600 0 +01}
+    {2325722400 3600 0 +01}
     {2352938400 0 1 +01}
     {2355962400 3600 0 +01}
     {2383178400 0 1 +01}
@@ -124,7 +124,7 @@ set TZData(:Africa/Casablanca) {
     {2536192800 0 1 +01}
     {2539821600 3600 0 +01}
     {2567037600 0 1 +01}
-    {2570061600 3600 0 +01}
+    {2570666400 3600 0 +01}
     {2597882400 0 1 +01}
     {2600906400 3600 0 +01}
     {2628122400 0 1 +01}
@@ -140,7 +140,7 @@ set TZData(:Africa/Casablanca) {
     {2781136800 0 1 +01}
     {2784765600 3600 0 +01}
     {2811981600 0 1 +01}
-    {2815005600 3600 0 +01}
+    {2815610400 3600 0 +01}
     {2842826400 0 1 +01}
     {2845850400 3600 0 +01}
     {2873066400 0 1 +01}
@@ -150,13 +150,13 @@ set TZData(:Africa/Casablanca) {
     {2934756000 0 1 +01}
     {2937780000 3600 0 +01}
     {2964996000 0 1 +01}
-    {2968020000 3600 0 +01}
+    {2968624800 3600 0 +01}
     {2995840800 0 1 +01}
     {2998864800 3600 0 +01}
     {3026080800 0 1 +01}
     {3029709600 3600 0 +01}
     {3056925600 0 1 +01}
-    {3059949600 3600 0 +01}
+    {3060554400 3600 0 +01}
     {3087770400 0 1 +01}
     {3090794400 3600 0 +01}
     {3118010400 0 1 +01}
@@ -166,13 +166,13 @@ set TZData(:Africa/Casablanca) {
     {3179700000 0 1 +01}
     {3182724000 3600 0 +01}
     {3209940000 0 1 +01}
-    {3212964000 3600 0 +01}
+    {3213568800 3600 0 +01}
     {3240784800 0 1 +01}
     {3243808800 3600 0 +01}
     {3271024800 0 1 +01}
     {3274653600 3600 0 +01}
     {3301869600 0 1 +01}
-    {3304893600 3600 0 +01}
+    {3305498400 3600 0 +01}
     {3332714400 0 1 +01}
     {3335738400 3600 0 +01}
     {3362954400 0 1 +01}
@@ -182,7 +182,7 @@ set TZData(:Africa/Casablanca) {
     {3424644000 0 1 +01}
     {3427668000 3600 0 +01}
     {3454884000 0 1 +01}
-    {3457908000 3600 0 +01}
+    {3458512800 3600 0 +01}
     {3485728800 0 1 +01}
     {3488752800 3600 0 +01}
     {3515968800 0 1 +01}
@@ -198,5 +198,5 @@ set TZData(:Africa/Casablanca) {
     {3669588000 0 1 +01}
     {3672612000 3600 0 +01}
     {3699828000 0 1 +01}
-    {3702852000 3600 0 +01}
+    {3703456800 3600 0 +01}
 }
diff --git a/library/tzdata/Africa/El_Aaiun b/library/tzdata/Africa/El_Aaiun
index 9f021a4..8dbbdea 100644
--- a/library/tzdata/Africa/El_Aaiun
+++ b/library/tzdata/Africa/El_Aaiun
@@ -49,7 +49,7 @@ set TZData(:Africa/El_Aaiun) {
     {1557021600 0 1 +01}
     {1560045600 3600 0 +01}
     {1587261600 0 1 +01}
-    {1590285600 3600 0 +01}
+    {1590890400 3600 0 +01}
     {1618106400 0 1 +01}
     {1621130400 3600 0 +01}
     {1648346400 0 1 +01}
@@ -65,7 +65,7 @@ set TZData(:Africa/El_Aaiun) {
     {1801965600 0 1 +01}
     {1804989600 3600 0 +01}
     {1832205600 0 1 +01}
-    {1835229600 3600 0 +01}
+    {1835834400 3600 0 +01}
     {1863050400 0 1 +01}
     {1866074400 3600 0 +01}
     {1893290400 0 1 +01}
@@ -81,7 +81,7 @@ set TZData(:Africa/El_Aaiun) {
     {2046304800 0 1 +01}
     {2049933600 3600 0 +01}
     {2077149600 0 1 +01}
-    {2080173600 3600 0 +01}
+    {2080778400 3600 0 +01}
     {2107994400 0 1 +01}
     {2111018400 3600 0 +01}
     {2138234400 0 1 +01}
@@ -97,7 +97,7 @@ set TZData(:Africa/El_Aaiun) {
     {2291248800 0 1 +01}
     {2294877600 3600 0 +01}
     {2322093600 0 1 +01}
-    {2325117600 3600 0 +01}
+    {2325722400 3600 0 +01}
     {2352938400 0 1 +01}
     {2355962400 3600 0 +01}
     {2383178400 0 1 +01}
@@ -113,7 +113,7 @@ set TZData(:Africa/El_Aaiun) {
     {2536192800 0 1 +01}
     {2539821600 3600 0 +01}
     {2567037600 0 1 +01}
-    {2570061600 3600 0 +01}
+    {2570666400 3600 0 +01}
     {2597882400 0 1 +01}
     {2600906400 3600 0 +01}
     {2628122400 0 1 +01}
@@ -129,7 +129,7 @@ set TZData(:Africa/El_Aaiun) {
     {2781136800 0 1 +01}
     {2784765600 3600 0 +01}
     {2811981600 0 1 +01}
-    {2815005600 3600 0 +01}
+    {2815610400 3600 0 +01}
     {2842826400 0 1 +01}
     {2845850400 3600 0 +01}
     {2873066400 0 1 +01}
@@ -139,13 +139,13 @@ set TZData(:Africa/El_Aaiun) {
     {2934756000 0 1 +01}
     {2937780000 3600 0 +01}
     {2964996000 0 1 +01}
-    {2968020000 3600 0 +01}
+    {2968624800 3600 0 +01}
     {2995840800 0 1 +01}
     {2998864800 3600 0 +01}
     {3026080800 0 1 +01}
     {3029709600 3600 0 +01}
     {3056925600 0 1 +01}
-    {3059949600 3600 0 +01}
+    {3060554400 3600 0 +01}
     {3087770400 0 1 +01}
     {3090794400 3600 0 +01}
     {3118010400 0 1 +01}
@@ -155,13 +155,13 @@ set TZData(:Africa/El_Aaiun) {
     {3179700000 0 1 +01}
     {3182724000 3600 0 +01}
     {3209940000 0 1 +01}
-    {3212964000 3600 0 +01}
+    {3213568800 3600 0 +01}
     {3240784800 0 1 +01}
     {3243808800 3600 0 +01}
     {3271024800 0 1 +01}
     {3274653600 3600 0 +01}
     {3301869600 0 1 +01}
-    {3304893600 3600 0 +01}
+    {3305498400 3600 0 +01}
     {3332714400 0 1 +01}
     {3335738400 3600 0 +01}
     {3362954400 0 1 +01}
@@ -171,7 +171,7 @@ set TZData(:Africa/El_Aaiun) {
     {3424644000 0 1 +01}
     {3427668000 3600 0 +01}
     {3454884000 0 1 +01}
-    {3457908000 3600 0 +01}
+    {3458512800 3600 0 +01}
     {3485728800 0 1 +01}
     {3488752800 3600 0 +01}
     {3515968800 0 1 +01}
@@ -187,5 +187,5 @@ set TZData(:Africa/El_Aaiun) {
     {3669588000 0 1 +01}
     {3672612000 3600 0 +01}
     {3699828000 0 1 +01}
-    {3702852000 3600 0 +01}
+    {3703456800 3600 0 +01}
 }
diff --git a/library/tzdata/America/Dawson b/library/tzdata/America/Dawson
index 8d2b641..1c827ff 100644
--- a/library/tzdata/America/Dawson
+++ b/library/tzdata/America/Dawson
@@ -93,164 +93,5 @@ set TZData(:America/Dawson) {
     {1541322000 -28800 0 PST}
     {1552212000 -25200 1 PDT}
     {1572771600 -28800 0 PST}
-    {1583661600 -25200 1 PDT}
-    {1604221200 -28800 0 PST}
-    {1615716000 -25200 1 PDT}
-    {1636275600 -28800 0 PST}
-    {1647165600 -25200 1 PDT}
-    {1667725200 -28800 0 PST}
-    {1678615200 -25200 1 PDT}
-    {1699174800 -28800 0 PST}
-    {1710064800 -25200 1 PDT}
-    {1730624400 -28800 0 PST}
-    {1741514400 -25200 1 PDT}
-    {1762074000 -28800 0 PST}
-    {1772964000 -25200 1 PDT}
-    {1793523600 -28800 0 PST}
-    {1805018400 -25200 1 PDT}
-    {1825578000 -28800 0 PST}
-    {1836468000 -25200 1 PDT}
-    {1857027600 -28800 0 PST}
-    {1867917600 -25200 1 PDT}
-    {1888477200 -28800 0 PST}
-    {1899367200 -25200 1 PDT}
-    {1919926800 -28800 0 PST}
-    {1930816800 -25200 1 PDT}
-    {1951376400 -28800 0 PST}
-    {1962871200 -25200 1 PDT}
-    {1983430800 -28800 0 PST}
-    {1994320800 -25200 1 PDT}
-    {2014880400 -28800 0 PST}
-    {2025770400 -25200 1 PDT}
-    {2046330000 -28800 0 PST}
-    {2057220000 -25200 1 PDT}
-    {2077779600 -28800 0 PST}
-    {2088669600 -25200 1 PDT}
-    {2109229200 -28800 0 PST}
-    {2120119200 -25200 1 PDT}
-    {2140678800 -28800 0 PST}
-    {2152173600 -25200 1 PDT}
-    {2172733200 -28800 0 PST}
-    {2183623200 -25200 1 PDT}
-    {2204182800 -28800 0 PST}
-    {2215072800 -25200 1 PDT}
-    {2235632400 -28800 0 PST}
-    {2246522400 -25200 1 PDT}
-    {2267082000 -28800 0 PST}
-    {2277972000 -25200 1 PDT}
-    {2298531600 -28800 0 PST}
-    {2309421600 -25200 1 PDT}
-    {2329981200 -28800 0 PST}
-    {2341476000 -25200 1 PDT}
-    {2362035600 -28800 0 PST}
-    {2372925600 -25200 1 PDT}
-    {2393485200 -28800 0 PST}
-    {2404375200 -25200 1 PDT}
-    {2424934800 -28800 0 PST}
-    {2435824800 -25200 1 PDT}
-    {2456384400 -28800 0 PST}
-    {2467274400 -25200 1 PDT}
-    {2487834000 -28800 0 PST}
-    {2499328800 -25200 1 PDT}
-    {2519888400 -28800 0 PST}
-    {2530778400 -25200 1 PDT}
-    {2551338000 -28800 0 PST}
-    {2562228000 -25200 1 PDT}
-    {2582787600 -28800 0 PST}
-    {2593677600 -25200 1 PDT}
-    {2614237200 -28800 0 PST}
-    {2625127200 -25200 1 PDT}
-    {2645686800 -28800 0 PST}
-    {2656576800 -25200 1 PDT}
-    {2677136400 -28800 0 PST}
-    {2688631200 -25200 1 PDT}
-    {2709190800 -28800 0 PST}
-    {2720080800 -25200 1 PDT}
-    {2740640400 -28800 0 PST}
-    {2751530400 -25200 1 PDT}
-    {2772090000 -28800 0 PST}
-    {2782980000 -25200 1 PDT}
-    {2803539600 -28800 0 PST}
-    {2814429600 -25200 1 PDT}
-    {2834989200 -28800 0 PST}
-    {2846484000 -25200 1 PDT}
-    {2867043600 -28800 0 PST}
-    {2877933600 -25200 1 PDT}
-    {2898493200 -28800 0 PST}
-    {2909383200 -25200 1 PDT}
-    {2929942800 -28800 0 PST}
-    {2940832800 -25200 1 PDT}
-    {2961392400 -28800 0 PST}
-    {2972282400 -25200 1 PDT}
-    {2992842000 -28800 0 PST}
-    {3003732000 -25200 1 PDT}
-    {3024291600 -28800 0 PST}
-    {3035786400 -25200 1 PDT}
-    {3056346000 -28800 0 PST}
-    {3067236000 -25200 1 PDT}
-    {3087795600 -28800 0 PST}
-    {3098685600 -25200 1 PDT}
-    {3119245200 -28800 0 PST}
-    {3130135200 -25200 1 PDT}
-    {3150694800 -28800 0 PST}
-    {3161584800 -25200 1 PDT}
-    {3182144400 -28800 0 PST}
-    {3193034400 -25200 1 PDT}
-    {3213594000 -28800 0 PST}
-    {3225088800 -25200 1 PDT}
-    {3245648400 -28800 0 PST}
-    {3256538400 -25200 1 PDT}
-    {3277098000 -28800 0 PST}
-    {3287988000 -25200 1 PDT}
-    {3308547600 -28800 0 PST}
-    {3319437600 -25200 1 PDT}
-    {3339997200 -28800 0 PST}
-    {3350887200 -25200 1 PDT}
-    {3371446800 -28800 0 PST}
-    {3382941600 -25200 1 PDT}
-    {3403501200 -28800 0 PST}
-    {3414391200 -25200 1 PDT}
-    {3434950800 -28800 0 PST}
-    {3445840800 -25200 1 PDT}
-    {3466400400 -28800 0 PST}
-    {3477290400 -25200 1 PDT}
-    {3497850000 -28800 0 PST}
-    {3508740000 -25200 1 PDT}
-    {3529299600 -28800 0 PST}
-    {3540189600 -25200 1 PDT}
-    {3560749200 -28800 0 PST}
-    {3572244000 -25200 1 PDT}
-    {3592803600 -28800 0 PST}
-    {3603693600 -25200 1 PDT}
-    {3624253200 -28800 0 PST}
-    {3635143200 -25200 1 PDT}
-    {3655702800 -28800 0 PST}
-    {3666592800 -25200 1 PDT}
-    {3687152400 -28800 0 PST}
-    {3698042400 -25200 1 PDT}
-    {3718602000 -28800 0 PST}
-    {3730096800 -25200 1 PDT}
-    {3750656400 -28800 0 PST}
-    {3761546400 -25200 1 PDT}
-    {3782106000 -28800 0 PST}
-    {3792996000 -25200 1 PDT}
-    {3813555600 -28800 0 PST}
-    {3824445600 -25200 1 PDT}
-    {3845005200 -28800 0 PST}
-    {3855895200 -25200 1 PDT}
-    {3876454800 -28800 0 PST}
-    {3887344800 -25200 1 PDT}
-    {3907904400 -28800 0 PST}
-    {3919399200 -25200 1 PDT}
-    {3939958800 -28800 0 PST}
-    {3950848800 -25200 1 PDT}
-    {3971408400 -28800 0 PST}
-    {3982298400 -25200 1 PDT}
-    {4002858000 -28800 0 PST}
-    {4013748000 -25200 1 PDT}
-    {4034307600 -28800 0 PST}
-    {4045197600 -25200 1 PDT}
-    {4065757200 -28800 0 PST}
-    {4076647200 -25200 1 PDT}
-    {4097206800 -28800 0 PST}
+    {1583661600 -25200 0 MST}
 }
diff --git a/library/tzdata/America/Godthab b/library/tzdata/America/Godthab
index 3e45f87..8bb7b73 100644
--- a/library/tzdata/America/Godthab
+++ b/library/tzdata/America/Godthab
@@ -1,246 +1,5 @@
 # created by tools/tclZIC.tcl - do not edit
-
-set TZData(:America/Godthab) {
-    {-9223372036854775808 -12416 0 LMT}
-    {-1686083584 -10800 0 -03}
-    {323845200 -7200 0 -02}
-    {338950800 -10800 0 -03}
-    {354675600 -7200 1 -02}
-    {370400400 -10800 0 -03}
-    {386125200 -7200 1 -02}
-    {401850000 -10800 0 -03}
-    {417574800 -7200 1 -02}
-    {433299600 -10800 0 -03}
-    {449024400 -7200 1 -02}
-    {465354000 -10800 0 -03}
-    {481078800 -7200 1 -02}
-    {496803600 -10800 0 -03}
-    {512528400 -7200 1 -02}
-    {528253200 -10800 0 -03}
-    {543978000 -7200 1 -02}
-    {559702800 -10800 0 -03}
-    {575427600 -7200 1 -02}
-    {591152400 -10800 0 -03}
-    {606877200 -7200 1 -02}
-    {622602000 -10800 0 -03}
-    {638326800 -7200 1 -02}
-    {654656400 -10800 0 -03}
-    {670381200 -7200 1 -02}
-    {686106000 -10800 0 -03}
-    {701830800 -7200 1 -02}
-    {717555600 -10800 0 -03}
-    {733280400 -7200 1 -02}
-    {749005200 -10800 0 -03}
-    {764730000 -7200 1 -02}
-    {780454800 -10800 0 -03}
-    {796179600 -7200 1 -02}
-    {811904400 -10800 0 -03}
-    {828234000 -7200 1 -02}
-    {846378000 -10800 0 -03}
-    {859683600 -7200 1 -02}
-    {877827600 -10800 0 -03}
-    {891133200 -7200 1 -02}
-    {909277200 -10800 0 -03}
-    {922582800 -7200 1 -02}
-    {941331600 -10800 0 -03}
-    {954032400 -7200 1 -02}
-    {972781200 -10800 0 -03}
-    {985482000 -7200 1 -02}
-    {1004230800 -10800 0 -03}
-    {1017536400 -7200 1 -02}
-    {1035680400 -10800 0 -03}
-    {1048986000 -7200 1 -02}
-    {1067130000 -10800 0 -03}
-    {1080435600 -7200 1 -02}
-    {1099184400 -10800 0 -03}
-    {1111885200 -7200 1 -02}
-    {1130634000 -10800 0 -03}
-    {1143334800 -7200 1 -02}
-    {1162083600 -10800 0 -03}
-    {1174784400 -7200 1 -02}
-    {1193533200 -10800 0 -03}
-    {1206838800 -7200 1 -02}
-    {1224982800 -10800 0 -03}
-    {1238288400 -7200 1 -02}
-    {1256432400 -10800 0 -03}
-    {1269738000 -7200 1 -02}
-    {1288486800 -10800 0 -03}
-    {1301187600 -7200 1 -02}
-    {1319936400 -10800 0 -03}
-    {1332637200 -7200 1 -02}
-    {1351386000 -10800 0 -03}
-    {1364691600 -7200 1 -02}
-    {1382835600 -10800 0 -03}
-    {1396141200 -7200 1 -02}
-    {1414285200 -10800 0 -03}
-    {1427590800 -7200 1 -02}
-    {1445734800 -10800 0 -03}
-    {1459040400 -7200 1 -02}
-    {1477789200 -10800 0 -03}
-    {1490490000 -7200 1 -02}
-    {1509238800 -10800 0 -03}
-    {1521939600 -7200 1 -02}
-    {1540688400 -10800 0 -03}
-    {1553994000 -7200 1 -02}
-    {1572138000 -10800 0 -03}
-    {1585443600 -7200 1 -02}
-    {1603587600 -10800 0 -03}
-    {1616893200 -7200 1 -02}
-    {1635642000 -10800 0 -03}
-    {1648342800 -7200 1 -02}
-    {1667091600 -10800 0 -03}
-    {1679792400 -7200 1 -02}
-    {1698541200 -10800 0 -03}
-    {1711846800 -7200 1 -02}
-    {1729990800 -10800 0 -03}
-    {1743296400 -7200 1 -02}
-    {1761440400 -10800 0 -03}
-    {1774746000 -7200 1 -02}
-    {1792890000 -10800 0 -03}
-    {1806195600 -7200 1 -02}
-    {1824944400 -10800 0 -03}
-    {1837645200 -7200 1 -02}
-    {1856394000 -10800 0 -03}
-    {1869094800 -7200 1 -02}
-    {1887843600 -10800 0 -03}
-    {1901149200 -7200 1 -02}
-    {1919293200 -10800 0 -03}
-    {1932598800 -7200 1 -02}
-    {1950742800 -10800 0 -03}
-    {1964048400 -7200 1 -02}
-    {1982797200 -10800 0 -03}
-    {1995498000 -7200 1 -02}
-    {2014246800 -10800 0 -03}
-    {2026947600 -7200 1 -02}
-    {2045696400 -10800 0 -03}
-    {2058397200 -7200 1 -02}
-    {2077146000 -10800 0 -03}
-    {2090451600 -7200 1 -02}
-    {2108595600 -10800 0 -03}
-    {2121901200 -7200 1 -02}
-    {2140045200 -10800 0 -03}
-    {2153350800 -7200 1 -02}
-    {2172099600 -10800 0 -03}
-    {2184800400 -7200 1 -02}
-    {2203549200 -10800 0 -03}
-    {2216250000 -7200 1 -02}
-    {2234998800 -10800 0 -03}
-    {2248304400 -7200 1 -02}
-    {2266448400 -10800 0 -03}
-    {2279754000 -7200 1 -02}
-    {2297898000 -10800 0 -03}
-    {2311203600 -7200 1 -02}
-    {2329347600 -10800 0 -03}
-    {2342653200 -7200 1 -02}
-    {2361402000 -10800 0 -03}
-    {2374102800 -7200 1 -02}
-    {2392851600 -10800 0 -03}
-    {2405552400 -7200 1 -02}
-    {2424301200 -10800 0 -03}
-    {2437606800 -7200 1 -02}
-    {2455750800 -10800 0 -03}
-    {2469056400 -7200 1 -02}
-    {2487200400 -10800 0 -03}
-    {2500506000 -7200 1 -02}
-    {2519254800 -10800 0 -03}
-    {2531955600 -7200 1 -02}
-    {2550704400 -10800 0 -03}
-    {2563405200 -7200 1 -02}
-    {2582154000 -10800 0 -03}
-    {2595459600 -7200 1 -02}
-    {2613603600 -10800 0 -03}
-    {2626909200 -7200 1 -02}
-    {2645053200 -10800 0 -03}
-    {2658358800 -7200 1 -02}
-    {2676502800 -10800 0 -03}
-    {2689808400 -7200 1 -02}
-    {2708557200 -10800 0 -03}
-    {2721258000 -7200 1 -02}
-    {2740006800 -10800 0 -03}
-    {2752707600 -7200 1 -02}
-    {2771456400 -10800 0 -03}
-    {2784762000 -7200 1 -02}
-    {2802906000 -10800 0 -03}
-    {2816211600 -7200 1 -02}
-    {2834355600 -10800 0 -03}
-    {2847661200 -7200 1 -02}
-    {2866410000 -10800 0 -03}
-    {2879110800 -7200 1 -02}
-    {2897859600 -10800 0 -03}
-    {2910560400 -7200 1 -02}
-    {2929309200 -10800 0 -03}
-    {2942010000 -7200 1 -02}
-    {2960758800 -10800 0 -03}
-    {2974064400 -7200 1 -02}
-    {2992208400 -10800 0 -03}
-    {3005514000 -7200 1 -02}
-    {3023658000 -10800 0 -03}
-    {3036963600 -7200 1 -02}
-    {3055712400 -10800 0 -03}
-    {3068413200 -7200 1 -02}
-    {3087162000 -10800 0 -03}
-    {3099862800 -7200 1 -02}
-    {3118611600 -10800 0 -03}
-    {3131917200 -7200 1 -02}
-    {3150061200 -10800 0 -03}
-    {3163366800 -7200 1 -02}
-    {3181510800 -10800 0 -03}
-    {3194816400 -7200 1 -02}
-    {3212960400 -10800 0 -03}
-    {3226266000 -7200 1 -02}
-    {3245014800 -10800 0 -03}
-    {3257715600 -7200 1 -02}
-    {3276464400 -10800 0 -03}
-    {3289165200 -7200 1 -02}
-    {3307914000 -10800 0 -03}
-    {3321219600 -7200 1 -02}
-    {3339363600 -10800 0 -03}
-    {3352669200 -7200 1 -02}
-    {3370813200 -10800 0 -03}
-    {3384118800 -7200 1 -02}
-    {3402867600 -10800 0 -03}
-    {3415568400 -7200 1 -02}
-    {3434317200 -10800 0 -03}
-    {3447018000 -7200 1 -02}
-    {3465766800 -10800 0 -03}
-    {3479072400 -7200 1 -02}
-    {3497216400 -10800 0 -03}
-    {3510522000 -7200 1 -02}
-    {3528666000 -10800 0 -03}
-    {3541971600 -7200 1 -02}
-    {3560115600 -10800 0 -03}
-    {3573421200 -7200 1 -02}
-    {3592170000 -10800 0 -03}
-    {3604870800 -7200 1 -02}
-    {3623619600 -10800 0 -03}
-    {3636320400 -7200 1 -02}
-    {3655069200 -10800 0 -03}
-    {3668374800 -7200 1 -02}
-    {3686518800 -10800 0 -03}
-    {3699824400 -7200 1 -02}
-    {3717968400 -10800 0 -03}
-    {3731274000 -7200 1 -02}
-    {3750022800 -10800 0 -03}
-    {3762723600 -7200 1 -02}
-    {3781472400 -10800 0 -03}
-    {3794173200 -7200 1 -02}
-    {3812922000 -10800 0 -03}
-    {3825622800 -7200 1 -02}
-    {3844371600 -10800 0 -03}
-    {3857677200 -7200 1 -02}
-    {3875821200 -10800 0 -03}
-    {3889126800 -7200 1 -02}
-    {3907270800 -10800 0 -03}
-    {3920576400 -7200 1 -02}
-    {3939325200 -10800 0 -03}
-    {3952026000 -7200 1 -02}
-    {3970774800 -10800 0 -03}
-    {3983475600 -7200 1 -02}
-    {4002224400 -10800 0 -03}
-    {4015530000 -7200 1 -02}
-    {4033674000 -10800 0 -03}
-    {4046979600 -7200 1 -02}
-    {4065123600 -10800 0 -03}
-    {4078429200 -7200 1 -02}
-    {4096573200 -10800 0 -03}
+if {![info exists TZData(America/Nuuk)]} {
+    LoadTimeZoneFile America/Nuuk
 }
+set TZData(:America/Godthab) $TZData(:America/Nuuk)
diff --git a/library/tzdata/America/Nuuk b/library/tzdata/America/Nuuk
new file mode 100644
index 0000000..8d85a81
--- /dev/null
+++ b/library/tzdata/America/Nuuk
@@ -0,0 +1,246 @@
+# created by tools/tclZIC.tcl - do not edit
+
+set TZData(:America/Nuuk) {
+    {-9223372036854775808 -12416 0 LMT}
+    {-1686083584 -10800 0 -03}
+    {323845200 -7200 0 -02}
+    {338950800 -10800 0 -03}
+    {354675600 -7200 1 -02}
+    {370400400 -10800 0 -03}
+    {386125200 -7200 1 -02}
+    {401850000 -10800 0 -03}
+    {417574800 -7200 1 -02}
+    {433299600 -10800 0 -03}
+    {449024400 -7200 1 -02}
+    {465354000 -10800 0 -03}
+    {481078800 -7200 1 -02}
+    {496803600 -10800 0 -03}
+    {512528400 -7200 1 -02}
+    {528253200 -10800 0 -03}
+    {543978000 -7200 1 -02}
+    {559702800 -10800 0 -03}
+    {575427600 -7200 1 -02}
+    {591152400 -10800 0 -03}
+    {606877200 -7200 1 -02}
+    {622602000 -10800 0 -03}
+    {638326800 -7200 1 -02}
+    {654656400 -10800 0 -03}
+    {670381200 -7200 1 -02}
+    {686106000 -10800 0 -03}
+    {701830800 -7200 1 -02}
+    {717555600 -10800 0 -03}
+    {733280400 -7200 1 -02}
+    {749005200 -10800 0 -03}
+    {764730000 -7200 1 -02}
+    {780454800 -10800 0 -03}
+    {796179600 -7200 1 -02}
+    {811904400 -10800 0 -03}
+    {828234000 -7200 1 -02}
+    {846378000 -10800 0 -03}
+    {859683600 -7200 1 -02}
+    {877827600 -10800 0 -03}
+    {891133200 -7200 1 -02}
+    {909277200 -10800 0 -03}
+    {922582800 -7200 1 -02}
+    {941331600 -10800 0 -03}
+    {954032400 -7200 1 -02}
+    {972781200 -10800 0 -03}
+    {985482000 -7200 1 -02}
+    {1004230800 -10800 0 -03}
+    {1017536400 -7200 1 -02}
+    {1035680400 -10800 0 -03}
+    {1048986000 -7200 1 -02}
+    {1067130000 -10800 0 -03}
+    {1080435600 -7200 1 -02}
+    {1099184400 -10800 0 -03}
+    {1111885200 -7200 1 -02}
+    {1130634000 -10800 0 -03}
+    {1143334800 -7200 1 -02}
+    {1162083600 -10800 0 -03}
+    {1174784400 -7200 1 -02}
+    {1193533200 -10800 0 -03}
+    {1206838800 -7200 1 -02}
+    {1224982800 -10800 0 -03}
+    {1238288400 -7200 1 -02}
+    {1256432400 -10800 0 -03}
+    {1269738000 -7200 1 -02}
+    {1288486800 -10800 0 -03}
+    {1301187600 -7200 1 -02}
+    {1319936400 -10800 0 -03}
+    {1332637200 -7200 1 -02}
+    {1351386000 -10800 0 -03}
+    {1364691600 -7200 1 -02}
+    {1382835600 -10800 0 -03}
+    {1396141200 -7200 1 -02}
+    {1414285200 -10800 0 -03}
+    {1427590800 -7200 1 -02}
+    {1445734800 -10800 0 -03}
+    {1459040400 -7200 1 -02}
+    {1477789200 -10800 0 -03}
+    {1490490000 -7200 1 -02}
+    {1509238800 -10800 0 -03}
+    {1521939600 -7200 1 -02}
+    {1540688400 -10800 0 -03}
+    {1553994000 -7200 1 -02}
+    {1572138000 -10800 0 -03}
+    {1585443600 -7200 1 -02}
+    {1603587600 -10800 0 -03}
+    {1616893200 -7200 1 -02}
+    {1635642000 -10800 0 -03}
+    {1648342800 -7200 1 -02}
+    {1667091600 -10800 0 -03}
+    {1679792400 -7200 1 -02}
+    {1698541200 -10800 0 -03}
+    {1711846800 -7200 1 -02}
+    {1729990800 -10800 0 -03}
+    {1743296400 -7200 1 -02}
+    {1761440400 -10800 0 -03}
+    {1774746000 -7200 1 -02}
+    {1792890000 -10800 0 -03}
+    {1806195600 -7200 1 -02}
+    {1824944400 -10800 0 -03}
+    {1837645200 -7200 1 -02}
+    {1856394000 -10800 0 -03}
+    {1869094800 -7200 1 -02}
+    {1887843600 -10800 0 -03}
+    {1901149200 -7200 1 -02}
+    {1919293200 -10800 0 -03}
+    {1932598800 -7200 1 -02}
+    {1950742800 -10800 0 -03}
+    {1964048400 -7200 1 -02}
+    {1982797200 -10800 0 -03}
+    {1995498000 -7200 1 -02}
+    {2014246800 -10800 0 -03}
+    {2026947600 -7200 1 -02}
+    {2045696400 -10800 0 -03}
+    {2058397200 -7200 1 -02}
+    {2077146000 -10800 0 -03}
+    {2090451600 -7200 1 -02}
+    {2108595600 -10800 0 -03}
+    {2121901200 -7200 1 -02}
+    {2140045200 -10800 0 -03}
+    {2153350800 -7200 1 -02}
+    {2172099600 -10800 0 -03}
+    {2184800400 -7200 1 -02}
+    {2203549200 -10800 0 -03}
+    {2216250000 -7200 1 -02}
+    {2234998800 -10800 0 -03}
+    {2248304400 -7200 1 -02}
+    {2266448400 -10800 0 -03}
+    {2279754000 -7200 1 -02}
+    {2297898000 -10800 0 -03}
+    {2311203600 -7200 1 -02}
+    {2329347600 -10800 0 -03}
+    {2342653200 -7200 1 -02}
+    {2361402000 -10800 0 -03}
+    {2374102800 -7200 1 -02}
+    {2392851600 -10800 0 -03}
+    {2405552400 -7200 1 -02}
+    {2424301200 -10800 0 -03}
+    {2437606800 -7200 1 -02}
+    {2455750800 -10800 0 -03}
+    {2469056400 -7200 1 -02}
+    {2487200400 -10800 0 -03}
+    {2500506000 -7200 1 -02}
+    {2519254800 -10800 0 -03}
+    {2531955600 -7200 1 -02}
+    {2550704400 -10800 0 -03}
+    {2563405200 -7200 1 -02}
+    {2582154000 -10800 0 -03}
+    {2595459600 -7200 1 -02}
+    {2613603600 -10800 0 -03}
+    {2626909200 -7200 1 -02}
+    {2645053200 -10800 0 -03}
+    {2658358800 -7200 1 -02}
+    {2676502800 -10800 0 -03}
+    {2689808400 -7200 1 -02}
+    {2708557200 -10800 0 -03}
+    {2721258000 -7200 1 -02}
+    {2740006800 -10800 0 -03}
+    {2752707600 -7200 1 -02}
+    {2771456400 -10800 0 -03}
+    {2784762000 -7200 1 -02}
+    {2802906000 -10800 0 -03}
+    {2816211600 -7200 1 -02}
+    {2834355600 -10800 0 -03}
+    {2847661200 -7200 1 -02}
+    {2866410000 -10800 0 -03}
+    {2879110800 -7200 1 -02}
+    {2897859600 -10800 0 -03}
+    {2910560400 -7200 1 -02}
+    {2929309200 -10800 0 -03}
+    {2942010000 -7200 1 -02}
+    {2960758800 -10800 0 -03}
+    {2974064400 -7200 1 -02}
+    {2992208400 -10800 0 -03}
+    {3005514000 -7200 1 -02}
+    {3023658000 -10800 0 -03}
+    {3036963600 -7200 1 -02}
+    {3055712400 -10800 0 -03}
+    {3068413200 -7200 1 -02}
+    {3087162000 -10800 0 -03}
+    {3099862800 -7200 1 -02}
+    {3118611600 -10800 0 -03}
+    {3131917200 -7200 1 -02}
+    {3150061200 -10800 0 -03}
+    {3163366800 -7200 1 -02}
+    {3181510800 -10800 0 -03}
+    {3194816400 -7200 1 -02}
+    {3212960400 -10800 0 -03}
+    {3226266000 -7200 1 -02}
+    {3245014800 -10800 0 -03}
+    {3257715600 -7200 1 -02}
+    {3276464400 -10800 0 -03}
+    {3289165200 -7200 1 -02}
+    {3307914000 -10800 0 -03}
+    {3321219600 -7200 1 -02}
+    {3339363600 -10800 0 -03}
+    {3352669200 -7200 1 -02}
+    {3370813200 -10800 0 -03}
+    {3384118800 -7200 1 -02}
+    {3402867600 -10800 0 -03}
+    {3415568400 -7200 1 -02}
+    {3434317200 -10800 0 -03}
+    {3447018000 -7200 1 -02}
+    {3465766800 -10800 0 -03}
+    {3479072400 -7200 1 -02}
+    {3497216400 -10800 0 -03}
+    {3510522000 -7200 1 -02}
+    {3528666000 -10800 0 -03}
+    {3541971600 -7200 1 -02}
+    {3560115600 -10800 0 -03}
+    {3573421200 -7200 1 -02}
+    {3592170000 -10800 0 -03}
+    {3604870800 -7200 1 -02}
+    {3623619600 -10800 0 -03}
+    {3636320400 -7200 1 -02}
+    {3655069200 -10800 0 -03}
+    {3668374800 -7200 1 -02}
+    {3686518800 -10800 0 -03}
+    {3699824400 -7200 1 -02}
+    {3717968400 -10800 0 -03}
+    {3731274000 -7200 1 -02}
+    {3750022800 -10800 0 -03}
+    {3762723600 -7200 1 -02}
+    {3781472400 -10800 0 -03}
+    {3794173200 -7200 1 -02}
+    {3812922000 -10800 0 -03}
+    {3825622800 -7200 1 -02}
+    {3844371600 -10800 0 -03}
+    {3857677200 -7200 1 -02}
+    {3875821200 -10800 0 -03}
+    {3889126800 -7200 1 -02}
+    {3907270800 -10800 0 -03}
+    {3920576400 -7200 1 -02}
+    {3939325200 -10800 0 -03}
+    {3952026000 -7200 1 -02}
+    {3970774800 -10800 0 -03}
+    {3983475600 -7200 1 -02}
+    {4002224400 -10800 0 -03}
+    {4015530000 -7200 1 -02}
+    {4033674000 -10800 0 -03}
+    {4046979600 -7200 1 -02}
+    {4065123600 -10800 0 -03}
+    {4078429200 -7200 1 -02}
+    {4096573200 -10800 0 -03}
+}
diff --git a/library/tzdata/America/Whitehorse b/library/tzdata/America/Whitehorse
index 1d61093..da0c0f0 100644
--- a/library/tzdata/America/Whitehorse
+++ b/library/tzdata/America/Whitehorse
@@ -93,164 +93,5 @@ set TZData(:America/Whitehorse) {
     {1541322000 -28800 0 PST}
     {1552212000 -25200 1 PDT}
     {1572771600 -28800 0 PST}
-    {1583661600 -25200 1 PDT}
-    {1604221200 -28800 0 PST}
-    {1615716000 -25200 1 PDT}
-    {1636275600 -28800 0 PST}
-    {1647165600 -25200 1 PDT}
-    {1667725200 -28800 0 PST}
-    {1678615200 -25200 1 PDT}
-    {1699174800 -28800 0 PST}
-    {1710064800 -25200 1 PDT}
-    {1730624400 -28800 0 PST}
-    {1741514400 -25200 1 PDT}
-    {1762074000 -28800 0 PST}
-    {1772964000 -25200 1 PDT}
-    {1793523600 -28800 0 PST}
-    {1805018400 -25200 1 PDT}
-    {1825578000 -28800 0 PST}
-    {1836468000 -25200 1 PDT}
-    {1857027600 -28800 0 PST}
-    {1867917600 -25200 1 PDT}
-    {1888477200 -28800 0 PST}
-    {1899367200 -25200 1 PDT}
-    {1919926800 -28800 0 PST}
-    {1930816800 -25200 1 PDT}
-    {1951376400 -28800 0 PST}
-    {1962871200 -25200 1 PDT}
-    {1983430800 -28800 0 PST}
-    {1994320800 -25200 1 PDT}
-    {2014880400 -28800 0 PST}
-    {2025770400 -25200 1 PDT}
-    {2046330000 -28800 0 PST}
-    {2057220000 -25200 1 PDT}
-    {2077779600 -28800 0 PST}
-    {2088669600 -25200 1 PDT}
-    {2109229200 -28800 0 PST}
-    {2120119200 -25200 1 PDT}
-    {2140678800 -28800 0 PST}
-    {2152173600 -25200 1 PDT}
-    {2172733200 -28800 0 PST}
-    {2183623200 -25200 1 PDT}
-    {2204182800 -28800 0 PST}
-    {2215072800 -25200 1 PDT}
-    {2235632400 -28800 0 PST}
-    {2246522400 -25200 1 PDT}
-    {2267082000 -28800 0 PST}
-    {2277972000 -25200 1 PDT}
-    {2298531600 -28800 0 PST}
-    {2309421600 -25200 1 PDT}
-    {2329981200 -28800 0 PST}
-    {2341476000 -25200 1 PDT}
-    {2362035600 -28800 0 PST}
-    {2372925600 -25200 1 PDT}
-    {2393485200 -28800 0 PST}
-    {2404375200 -25200 1 PDT}
-    {2424934800 -28800 0 PST}
-    {2435824800 -25200 1 PDT}
-    {2456384400 -28800 0 PST}
-    {2467274400 -25200 1 PDT}
-    {2487834000 -28800 0 PST}
-    {2499328800 -25200 1 PDT}
-    {2519888400 -28800 0 PST}
-    {2530778400 -25200 1 PDT}
-    {2551338000 -28800 0 PST}
-    {2562228000 -25200 1 PDT}
-    {2582787600 -28800 0 PST}
-    {2593677600 -25200 1 PDT}
-    {2614237200 -28800 0 PST}
-    {2625127200 -25200 1 PDT}
-    {2645686800 -28800 0 PST}
-    {2656576800 -25200 1 PDT}
-    {2677136400 -28800 0 PST}
-    {2688631200 -25200 1 PDT}
-    {2709190800 -28800 0 PST}
-    {2720080800 -25200 1 PDT}
-    {2740640400 -28800 0 PST}
-    {2751530400 -25200 1 PDT}
-    {2772090000 -28800 0 PST}
-    {2782980000 -25200 1 PDT}
-    {2803539600 -28800 0 PST}
-    {2814429600 -25200 1 PDT}
-    {2834989200 -28800 0 PST}
-    {2846484000 -25200 1 PDT}
-    {2867043600 -28800 0 PST}
-    {2877933600 -25200 1 PDT}
-    {2898493200 -28800 0 PST}
-    {2909383200 -25200 1 PDT}
-    {2929942800 -28800 0 PST}
-    {2940832800 -25200 1 PDT}
-    {2961392400 -28800 0 PST}
-    {2972282400 -25200 1 PDT}
-    {2992842000 -28800 0 PST}
-    {3003732000 -25200 1 PDT}
-    {3024291600 -28800 0 PST}
-    {3035786400 -25200 1 PDT}
-    {3056346000 -28800 0 PST}
-    {3067236000 -25200 1 PDT}
-    {3087795600 -28800 0 PST}
-    {3098685600 -25200 1 PDT}
-    {3119245200 -28800 0 PST}
-    {3130135200 -25200 1 PDT}
-    {3150694800 -28800 0 PST}
-    {3161584800 -25200 1 PDT}
-    {3182144400 -28800 0 PST}
-    {3193034400 -25200 1 PDT}
-    {3213594000 -28800 0 PST}
-    {3225088800 -25200 1 PDT}
-    {3245648400 -28800 0 PST}
-    {3256538400 -25200 1 PDT}
-    {3277098000 -28800 0 PST}
-    {3287988000 -25200 1 PDT}
-    {3308547600 -28800 0 PST}
-    {3319437600 -25200 1 PDT}
-    {3339997200 -28800 0 PST}
-    {3350887200 -25200 1 PDT}
-    {3371446800 -28800 0 PST}
-    {3382941600 -25200 1 PDT}
-    {3403501200 -28800 0 PST}
-    {3414391200 -25200 1 PDT}
-    {3434950800 -28800 0 PST}
-    {3445840800 -25200 1 PDT}
-    {3466400400 -28800 0 PST}
-    {3477290400 -25200 1 PDT}
-    {3497850000 -28800 0 PST}
-    {3508740000 -25200 1 PDT}
-    {3529299600 -28800 0 PST}
-    {3540189600 -25200 1 PDT}
-    {3560749200 -28800 0 PST}
-    {3572244000 -25200 1 PDT}
-    {3592803600 -28800 0 PST}
-    {3603693600 -25200 1 PDT}
-    {3624253200 -28800 0 PST}
-    {3635143200 -25200 1 PDT}
-    {3655702800 -28800 0 PST}
-    {3666592800 -25200 1 PDT}
-    {3687152400 -28800 0 PST}
-    {3698042400 -25200 1 PDT}
-    {3718602000 -28800 0 PST}
-    {3730096800 -25200 1 PDT}
-    {3750656400 -28800 0 PST}
-    {3761546400 -25200 1 PDT}
-    {3782106000 -28800 0 PST}
-    {3792996000 -25200 1 PDT}
-    {3813555600 -28800 0 PST}
-    {3824445600 -25200 1 PDT}
-    {3845005200 -28800 0 PST}
-    {3855895200 -25200 1 PDT}
-    {3876454800 -28800 0 PST}
-    {3887344800 -25200 1 PDT}
-    {3907904400 -28800 0 PST}
-    {3919399200 -25200 1 PDT}
-    {3939958800 -28800 0 PST}
-    {3950848800 -25200 1 PDT}
-    {3971408400 -28800 0 PST}
-    {3982298400 -25200 1 PDT}
-    {4002858000 -28800 0 PST}
-    {4013748000 -25200 1 PDT}
-    {4034307600 -28800 0 PST}
-    {4045197600 -25200 1 PDT}
-    {4065757200 -28800 0 PST}
-    {4076647200 -25200 1 PDT}
-    {4097206800 -28800 0 PST}
+    {1583661600 -25200 0 MST}
 }
diff --git a/library/tzdata/Asia/Shanghai b/library/tzdata/Asia/Shanghai
index 66bc4339..0fcf802 100644
--- a/library/tzdata/Asia/Shanghai
+++ b/library/tzdata/Asia/Shanghai
@@ -3,6 +3,8 @@
 set TZData(:Asia/Shanghai) {
     {-9223372036854775808 29143 0 LMT}
     {-2177481943 28800 0 CST}
+    {-1600675200 32400 1 CDT}
+    {-1585904400 28800 0 CST}
     {-933667200 32400 1 CDT}
     {-922093200 28800 0 CST}
     {-908870400 32400 1 CDT}
-- 
cgit v0.12