diff --git a/modules/luci-lua-runtime/luasrc/sys/zoneinfo/tzdata.lua b/modules/luci-lua-runtime/luasrc/sys/zoneinfo/tzdata.lua
index 74dbce36be..f016adfff8 100644
--- a/modules/luci-lua-runtime/luasrc/sys/zoneinfo/tzdata.lua
+++ b/modules/luci-lua-runtime/luasrc/sys/zoneinfo/tzdata.lua
@@ -16,14 +16,14 @@ TZ = {
 	{ 'Africa/Brazzaville', 'WAT-1' },
 	{ 'Africa/Bujumbura', 'CAT-2' },
 	{ 'Africa/Cairo', 'EET-2EEST,M4.5.5/0,M10.5.4/24' },
-	{ 'Africa/Casablanca', '<+01>-1' },
+	{ 'Africa/Casablanca', '<+00>0' },
 	{ 'Africa/Ceuta', 'CET-1CEST,M3.5.0,M10.5.0/3' },
 	{ 'Africa/Conakry', 'GMT0' },
 	{ 'Africa/Dakar', 'GMT0' },
 	{ 'Africa/Dar_es_Salaam', 'EAT-3' },
 	{ 'Africa/Djibouti', 'EAT-3' },
 	{ 'Africa/Douala', 'WAT-1' },
-	{ 'Africa/El_Aaiun', '<+01>-1' },
+	{ 'Africa/El_Aaiun', '<+00>0' },
 	{ 'Africa/Freetown', 'GMT0' },
 	{ 'Africa/Gaborone', 'CAT-2' },
 	{ 'Africa/Harare', 'CAT-2' },
@@ -104,7 +104,7 @@ TZ = {
 	{ 'America/Denver', 'MST7MDT,M3.2.0,M11.1.0' },
 	{ 'America/Detroit', 'EST5EDT,M3.2.0,M11.1.0' },
 	{ 'America/Dominica', 'AST4' },
-	{ 'America/Edmonton', 'MST7MDT,M3.2.0,M11.1.0' },
+	{ 'America/Edmonton', 'CST6' },
 	{ 'America/Eirunepe', '<-05>5' },
 	{ 'America/El_Salvador', 'CST6' },
 	{ 'America/Fort_Nelson', 'MST7' },