Get around issue #3 by modifying the tz-shorthands file

README.md

@@ -39,6 +39,7 @@ This file was created by:
   - Removing ambiguities (`Australia/West`, `Brazil/East`, `Brazil/West`)
   - Removing duplicates (the shorter one, if applicable, is conserved, otherwise alphabetically)
 - Adding `PST` and `PDT`
+- Due to [issue #3](https://github.com/Epholys/ultz/issues/3), `GMT+X` and `GMT-X` are swapped, as well as `Etc/GMT+X`
 
 ## Limitations
 

ultz/tz-shorthands.csv

@@ -169,32 +169,58 @@ GAZA,Asia/Gaza
 GENERAL,Mexico/General
 GIBRALTAR,Europe/Gibraltar
 GLACE_BAY,America/Glace_Bay
-GMT+10,Etc/GMT+10
-GMT-10,Etc/GMT-10
-GMT+11,Etc/GMT+11
-GMT-11,Etc/GMT-11
-GMT+12,Etc/GMT+12
-GMT-12,Etc/GMT-12
-GMT-13,Etc/GMT-13
-GMT-14,Etc/GMT-14
-GMT+1,Etc/GMT+1
-GMT-1,Etc/GMT-1
-GMT+2,Etc/GMT+2
-GMT-2,Etc/GMT-2
-GMT+3,Etc/GMT+3
-GMT-3,Etc/GMT-3
-GMT+4,Etc/GMT+4
-GMT-4,Etc/GMT-4
-GMT+5,Etc/GMT+5
-GMT-5,Etc/GMT-5
-GMT+6,Etc/GMT+6
-GMT-6,Etc/GMT-6
-GMT+7,Etc/GMT+7
-GMT-7,Etc/GMT-7
-GMT+8,Etc/GMT+8
-GMT-8,Etc/GMT-8
-GMT+9,Etc/GMT+9
-GMT-9,Etc/GMT-9
+GMT+10,Etc/GMT-10
+GMT-10,Etc/GMT+10
+GMT+11,Etc/GMT-11
+GMT-11,Etc/GMT+11
+GMT+12,Etc/GMT-12
+GMT-12,Etc/GMT+12
+GMT-13,Etc/GMT+13
+GMT-14,Etc/GMT+14
+GMT+1,Etc/GMT-1
+GMT-1,Etc/GMT+1
+GMT+2,Etc/GMT-2
+GMT-2,Etc/GMT+2
+GMT+3,Etc/GMT-3
+GMT-3,Etc/GMT+3
+GMT+4,Etc/GMT-4
+GMT-4,Etc/GMT+4
+GMT+5,Etc/GMT-5
+GMT-5,Etc/GMT+5
+GMT+6,Etc/GMT-6
+GMT-6,Etc/GMT+6
+GMT+7,Etc/GMT-7
+GMT-7,Etc/GMT+7
+GMT+8,Etc/GMT-8
+GMT-8,Etc/GMT+8
+GMT+9,Etc/GMT-9
+GMT-9,Etc/GMT+9
+ETC/GMT+10,Etc/GMT-10
+ETC/GMT-10,Etc/GMT+10
+ETC/GMT+11,Etc/GMT-11
+ETC/GMT-11,Etc/GMT+11
+ETC/GMT+12,Etc/GMT-12
+ETC/GMT-12,Etc/GMT+12
+ETC/GMT-13,Etc/GMT+13
+ETC/GMT-14,Etc/GMT+14
+ETC/GMT+1,Etc/GMT-1
+ETC/GMT-1,Etc/GMT+1
+ETC/GMT+2,Etc/GMT-2
+ETC/GMT-2,Etc/GMT+2
+ETC/GMT+3,Etc/GMT-3
+ETC/GMT-3,Etc/GMT+3
+ETC/GMT+4,Etc/GMT-4
+ETC/GMT-4,Etc/GMT+4
+ETC/GMT+5,Etc/GMT-5
+ETC/GMT-5,Etc/GMT+5
+ETC/GMT+6,Etc/GMT-6
+ETC/GMT-6,Etc/GMT+6
+ETC/GMT+7,Etc/GMT-7
+ETC/GMT-7,Etc/GMT+7
+ETC/GMT+8,Etc/GMT-8
+ETC/GMT-8,Etc/GMT+8
+ETC/GMT+9,Etc/GMT-9
+ETC/GMT-9,Etc/GMT+9
 GODTHAB,America/Godthab
 GOOSE_BAY,America/Goose_Bay
 GRAND_TURK,America/Grand_Turk