diff --git a/tztable.h b/tztable.h
--- a/tztable.h
+++ b/tztable.h
@@ -9,7 +9,6 @@
     "Asia/Yerevan",
     "Africa/Luanda",
     "Antarctica/McMurdo",
-    "Antarctica/South_Pole",
     "Antarctica/Rothera",
     "Antarctica/Palmer",
     "Antarctica/Mawson",
@@ -18,6 +17,7 @@
     "Antarctica/Vostok",
     "Antarctica/DumontDUrville",
     "Antarctica/Syowa",
+    "Antarctica/Troll",
     "America/Argentina/Buenos_Aires",
     "America/Argentina/Cordoba",
     "America/Argentina/Salta",
@@ -89,7 +89,6 @@
     "America/Moncton",
     "America/Goose_Bay",
     "America/Blanc-Sablon",
-    "America/Montreal",
     "America/Toronto",
     "America/Nipigon",
     "America/Thunder_Bay",
@@ -123,10 +122,7 @@
     "Pacific/Easter",
     "Africa/Douala",
     "Asia/Shanghai",
-    "Asia/Harbin",
-    "Asia/Chongqing",
     "Asia/Urumqi",
-    "Asia/Kashgar",
     "America/Bogota",
     "America/Costa_Rica",
     "America/Havana",
@@ -290,6 +286,7 @@
     "Pacific/Marquesas",
     "Pacific/Gambier",
     "Pacific/Port_Moresby",
+    "Pacific/Bougainville",
     "Asia/Manila",
     "Asia/Karachi",
     "Europe/Warsaw",
@@ -309,6 +306,7 @@
     "Europe/Belgrade",
     "Europe/Kaliningrad",
     "Europe/Moscow",
+    "Europe/Simferopol",
     "Europe/Volgograd",
     "Europe/Samara",
     "Asia/Yekaterinburg",
@@ -317,12 +315,14 @@
     "Asia/Novokuznetsk",
     "Asia/Krasnoyarsk",
     "Asia/Irkutsk",
+    "Asia/Chita",
     "Asia/Yakutsk",
     "Asia/Khandyga",
     "Asia/Vladivostok",
     "Asia/Sakhalin",
     "Asia/Ust-Nera",
     "Asia/Magadan",
+    "Asia/Srednekolymsk",
     "Asia/Kamchatka",
     "Asia/Anadyr",
     "Africa/Kigali",
@@ -366,7 +366,6 @@
     "Europe/Kiev",
     "Europe/Uzhgorod",
     "Europe/Zaporozhye",
-    "Europe/Simferopol",
     "Africa/Kampala",
     "Pacific/Johnston",
     "Pacific/Midway",
@@ -390,16 +389,15 @@
     "America/North_Dakota/Beulah",
     "America/Denver",
     "America/Boise",
-    "America/Shiprock",
     "America/Phoenix",
     "America/Los_Angeles",
+    "America/Metlakatla",
     "America/Anchorage",
     "America/Juneau",
     "America/Sitka",
     "America/Yakutat",
     "America/Nome",
     "America/Adak",
-    "America/Metlakatla",
     "Pacific/Honolulu",
     "America/Montevideo",
     "Asia/Samarkand",
@@ -417,7 +415,117 @@
     "Indian/Mayotte",
     "Africa/Johannesburg",
     "Africa/Lusaka",
-    "Africa/Harare"
+    "Africa/Harare",
+    "Africa/Asmera",
+    "Africa/Timbuktu",
+    "America/Argentina/ComodRivadavia",
+    "America/Atka",
+    "America/Buenos_Aires",
+    "America/Catamarca",
+    "America/Coral_Harbour",
+    "America/Cordoba",
+    "America/Ensenada",
+    "America/Fort_Wayne",
+    "America/Indianapolis",
+    "America/Jujuy",
+    "America/Knox_IN",
+    "America/Louisville",
+    "America/Mendoza",
+    "America/Porto_Acre",
+    "America/Rosario",
+    "America/Virgin",
+    "Asia/Ashkhabad",
+    "Asia/Chungking",
+    "Asia/Dacca",
+    "Asia/Katmandu",
+    "Asia/Calcutta",
+    "Asia/Macao",
+    "Asia/Tel_Aviv",
+    "Asia/Saigon",
+    "Asia/Thimbu",
+    "Asia/Ujung_Pandang",
+    "Asia/Ulan_Bator",
+    "Atlantic/Faeroe",
+    "Atlantic/Jan_Mayen",
+    "Australia/ACT",
+    "Australia/Canberra",
+    "Australia/LHI",
+    "Australia/NSW",
+    "Australia/North",
+    "Australia/Queensland",
+    "Australia/South",
+    "Australia/Tasmania",
+    "Australia/Victoria",
+    "Australia/West",
+    "Australia/Yancowinna",
+    "Brazil/Acre",
+    "Brazil/DeNoronha",
+    "Brazil/East",
+    "Brazil/West",
+    "Canada/Atlantic",
+    "Canada/Central",
+    "Canada/East-Saskatchewan",
+    "Canada/Eastern",
+    "Canada/Mountain",
+    "Canada/Newfoundland",
+    "Canada/Pacific",
+    "Canada/Saskatchewan",
+    "Canada/Yukon",
+    "Chile/Continental",
+    "Chile/EasterIsland",
+    "Cuba",
+    "Egypt",
+    "Eire",
+    "Europe/Belfast",
+    "Europe/Tiraspol",
+    "GB",
+    "GB-Eire",
+    "GMT+0",
+    "GMT-0",
+    "GMT0",
+    "Greenwich",
+    "Hongkong",
+    "Iceland",
+    "Iran",
+    "Israel",
+    "Jamaica",
+    "Japan",
+    "Kwajalein",
+    "Libya",
+    "Mexico/BajaNorte",
+    "Mexico/BajaSur",
+    "Mexico/General",
+    "NZ",
+    "NZ-CHAT",
+    "Navajo",
+    "PRC",
+    "Pacific/Samoa",
+    "Pacific/Yap",
+    "Pacific/Truk",
+    "Pacific/Ponape",
+    "Poland",
+    "Portugal",
+    "ROC",
+    "ROK",
+    "Singapore",
+    "Turkey",
+    "UCT",
+    "US/Alaska",
+    "US/Aleutian",
+    "US/Arizona",
+    "US/Central",
+    "US/East-Indiana",
+    "US/Eastern",
+    "US/Hawaii",
+    "US/Indiana-Starke",
+    "US/Michigan",
+    "US/Mountain",
+    "US/Pacific",
+    "US/Samoa",
+    "UTC",
+    "Universal",
+    "W-SU",
+    "Zulu"
 };
 
 static const long unsigned int numOlsonTimezones = sizeof olsonTimezones / sizeof *olsonTimezones;
diff --git a/utils/zonetabconversion.py b/utils/zonetabconversion.py
--- a/utils/zonetabconversion.py
+++ b/utils/zonetabconversion.py
@@ -21,9 +21,24 @@
             tztable.write(",\n    \"")
         tztable.write(tz)
         tztable.write("\"")
-        
+zonefile.close()
+
+#add more for the backward file
+backward = open("/usr/share/libtimezonemap/backward", "r")
+for line in backward:
+    if line.startswith('#'):
+        continue
+    else:
+        tzs = line.split(None)
+        if len(tzs) > 2:
+            tz = tzs[2]
+            print tz
+            tztable.write(",\n    \"")
+            tztable.write(tz)
+            tztable.write("\"")
+backward.close()
+
 tztable.write("\n};\n")
 tztable.write("\n")
-tztable.write("static const int numOlsonTimezones = sizeof olsonTimezones / sizeof *olsonTimezones;\n")
+tztable.write("static const long unsigned int numOlsonTimezones = sizeof olsonTimezones / sizeof *olsonTimezones;\n")
 tztable.write("\n")
-