diff --git a/cmd/time.go b/cmd/time.go
index 190067c..8619348 100644
--- a/cmd/time.go
+++ b/cmd/time.go
@@ -2,434 +2,14 @@ package cmd
 
 import (
 	"fmt"
+	"os"
 	"strings"
 	"time"
+	"unicode"
 
 	"github.com/spf13/cobra"
 )
 
-var timezones = []string{
-	"Africa/Abidjan",
-	"Africa/Accra",
-	"Africa/Addis_Ababa",
-	"Africa/Algiers",
-	"Africa/Asmara",
-	"Africa/Bamako",
-	"Africa/Bangui",
-	"Africa/Banjul",
-	"Africa/Bissau",
-	"Africa/Blantyre",
-	"Africa/Brazzaville",
-	"Africa/Bujumbura",
-	"Africa/Cairo",
-	"Africa/Casablanca",
-	"Africa/Ceuta",
-	"Africa/Conakry",
-	"Africa/Dakar",
-	"Africa/Dar_es_Salaam",
-	"Africa/Djibouti",
-	"Africa/Douala",
-	"Africa/El_Aaiun",
-	"Africa/Freetown",
-	"Africa/Gaborone",
-	"Africa/Harare",
-	"Africa/Johannesburg",
-	"Africa/Juba",
-	"Africa/Kampala",
-	"Africa/Khartoum",
-	"Africa/Kigali",
-	"Africa/Kinshasa",
-	"Africa/Lagos",
-	"Africa/Libreville",
-	"Africa/Lome",
-	"Africa/Luanda",
-	"Africa/Lubumbashi",
-	"Africa/Lusaka",
-	"Africa/Malabo",
-	"Africa/Maputo",
-	"Africa/Maseru",
-	"Africa/Mbabane",
-	"Africa/Mogadishu",
-	"Africa/Monrovia",
-	"Africa/Nairobi",
-	"Africa/Ndjamena",
-	"Africa/Niamey",
-	"Africa/Nouakchott",
-	"Africa/Ouagadougou",
-	"Africa/Porto-Novo",
-	"Africa/Sao_Tome",
-	"Africa/Tripoli",
-	"Africa/Tunis",
-	"Africa/Windhoek",
-	"America/Adak",
-	"America/Anchorage",
-	"America/Anguilla",
-	"America/Antigua",
-	"America/Araguaina",
-	"America/Argentina/Buenos_Aires",
-	"America/Argentina/Catamarca",
-	"America/Argentina/Cordoba",
-	"America/Argentina/Jujuy",
-	"America/Argentina/La_Rioja",
-	"America/Argentina/Mendoza",
-	"America/Argentina/Rio_Gallegos",
-	"America/Argentina/Salta",
-	"America/Argentina/San_Juan",
-	"America/Argentina/San_Luis",
-	"America/Argentina/Tucuman",
-	"America/Argentina/Ushuaia",
-	"America/Aruba",
-	"America/Asuncion",
-	"America/Atikokan",
-	"America/Bahia",
-	"America/Bahia_Banderas",
-	"America/Barbados",
-	"America/Belem",
-	"America/Belize",
-	"America/Blanc-Sablon",
-	"America/Boa_Vista",
-	"America/Bogota",
-	"America/Boise",
-	"America/Cambridge_Bay",
-	"America/Campo_Grande",
-	"America/Cancun",
-	"America/Caracas",
-	"America/Cayenne",
-	"America/Cayman",
-	"America/Chicago",
-	"America/Chihuahua",
-	"America/Ciudad_Juarez",
-	"America/Costa_Rica",
-	"America/Creston",
-	"America/Cuiaba",
-	"America/Curacao",
-	"America/Danmarkshavn",
-	"America/Dawson",
-	"America/Dawson_Creek",
-	"America/Denver",
-	"America/Detroit",
-	"America/Dominica",
-	"America/Edmonton",
-	"America/Eirunepe",
-	"America/El_Salvador",
-	"America/Fort_Nelson",
-	"America/Fortaleza",
-	"America/Glace_Bay",
-	"America/Goose_Bay",
-	"America/Grand_Turk",
-	"America/Grenada",
-	"America/Guadeloupe",
-	"America/Guatemala",
-	"America/Guayaquil",
-	"America/Guyana",
-	"America/Halifax",
-	"America/Havana",
-	"America/Hermosillo",
-	"America/Indiana/Indianapolis",
-	"America/Indiana/Knox",
-	"America/Indiana/Marengo",
-	"America/Indiana/Petersburg",
-	"America/Indiana/Tell_City",
-	"America/Indiana/Vevay",
-	"America/Indiana/Vincennes",
-	"America/Indiana/Winamac",
-	"America/Inuvik",
-	"America/Iqaluit",
-	"America/Jamaica",
-	"America/Juneau",
-	"America/Kentucky/Louisville",
-	"America/Kentucky/Monticello",
-	"America/Kralendijk",
-	"America/La_Paz",
-	"America/Lima",
-	"America/Los_Angeles",
-	"America/Lower_Princes",
-	"America/Maceio",
-	"America/Managua",
-	"America/Manaus",
-	"America/Marigot",
-	"America/Martinique",
-	"America/Matamoros",
-	"America/Mazatlan",
-	"America/Menominee",
-	"America/Merida",
-	"America/Metlakatla",
-	"America/Mexico_City",
-	"America/Miquelon",
-	"America/Moncton",
-	"America/Monterrey",
-	"America/Montevideo",
-	"America/Montserrat",
-	"America/Nassau",
-	"America/New_York",
-	"America/Nome",
-	"America/Noronha",
-	"America/North_Dakota/Beulah",
-	"America/North_Dakota/Center",
-	"America/North_Dakota/New_Salem",
-	"America/Nuuk",
-	"America/Ojinaga",
-	"America/Panama",
-	"America/Paramaribo",
-	"America/Phoenix",
-	"America/Port-au-Prince",
-	"America/Port_of_Spain",
-	"America/Porto_Velho",
-	"America/Puerto_Rico",
-	"America/Punta_Arenas",
-	"America/Rankin_Inlet",
-	"America/Recife",
-	"America/Regina",
-	"America/Resolute",
-	"America/Rio_Branco",
-	"America/Santarem",
-	"America/Santiago",
-	"America/Santo_Domingo",
-	"America/Sao_Paulo",
-	"America/Scoresbysund",
-	"America/Sitka",
-	"America/St_Barthelemy",
-	"America/St_Johns",
-	"America/St_Kitts",
-	"America/St_Lucia",
-	"America/St_Thomas",
-	"America/St_Vincent",
-	"America/Swift_Current",
-	"America/Tegucigalpa",
-	"America/Thule",
-	"America/Tijuana",
-	"America/Toronto",
-	"America/Tortola",
-	"America/Vancouver",
-	"America/Whitehorse",
-	"America/Winnipeg",
-	"America/Yakutat",
-	"America/Yellowknife",
-	"Antarctica/Casey",
-	"Antarctica/Davis",
-	"Antarctica/DumontDUrville",
-	"Antarctica/Macquarie",
-	"Antarctica/Mawson",
-	"Antarctica/McMurdo",
-	"Antarctica/Palmer",
-	"Antarctica/Rothera",
-	"Antarctica/Syowa",
-	"Antarctica/Troll",
-	"Antarctica/Vostok",
-	"Arctic/Longyearbyen",
-	"Asia/Aden",
-	"Asia/Almaty",
-	"Asia/Amman",
-	"Asia/Anadyr",
-	"Asia/Aqtau",
-	"Asia/Aqtobe",
-	"Asia/Ashgabat",
-	"Asia/Atyrau",
-	"Asia/Baghdad",
-	"Asia/Bahrain",
-	"Asia/Baku",
-	"Asia/Bangkok",
-	"Asia/Barnaul",
-	"Asia/Beirut",
-	"Asia/Bishkek",
-	"Asia/Brunei",
-	"Asia/Chita",
-	"Asia/Choibalsan",
-	"Asia/Colombo",
-	"Asia/Damascus",
-	"Asia/Dhaka",
-	"Asia/Dili",
-	"Asia/Dubai",
-	"Asia/Dushanbe",
-	"Asia/Famagusta",
-	"Asia/Gaza",
-	"Asia/Hebron",
-	"Asia/Ho_Chi_Minh",
-	"Asia/Hong_Kong",
-	"Asia/Hovd",
-	"Asia/Irkutsk",
-	"Asia/Jakarta",
-	"Asia/Jayapura",
-	"Asia/Jerusalem",
-	"Asia/Kabul",
-	"Asia/Kamchatka",
-	"Asia/Karachi",
-	"Asia/Kathmandu",
-	"Asia/Khandyga",
-	"Asia/Kolkata",
-	"Asia/Krasnoyarsk",
-	"Asia/Kuala_Lumpur",
-	"Asia/Kuching",
-	"Asia/Kuwait",
-	"Asia/Macau",
-	"Asia/Magadan",
-	"Asia/Makassar",
-	"Asia/Manila",
-	"Asia/Muscat",
-	"Asia/Nicosia",
-	"Asia/Novokuznetsk",
-	"Asia/Novosibirsk",
-	"Asia/Omsk",
-	"Asia/Oral",
-	"Asia/Phnom_Penh",
-	"Asia/Pontianak",
-	"Asia/Pyongyang",
-	"Asia/Qatar",
-	"Asia/Qostanay",
-	"Asia/Qyzylorda",
-	"Asia/Riyadh",
-	"Asia/Sakhalin",
-	"Asia/Samarkand",
-	"Asia/Seoul",
-	"Asia/Shanghai",
-	"Asia/Singapore",
-	"Asia/Srednekolymsk",
-	"Asia/Taipei",
-	"Asia/Tashkent",
-	"Asia/Tbilisi",
-	"Asia/Tehran",
-	"Asia/Thimphu",
-	"Asia/Tokyo",
-	"Asia/Tomsk",
-	"Asia/Ulaanbaatar",
-	"Asia/Urumqi",
-	"Asia/Ust-Nera",
-	"Asia/Vientiane",
-	"Asia/Vladivostok",
-	"Asia/Yakutsk",
-	"Asia/Yangon",
-	"Asia/Yekaterinburg",
-	"Asia/Yerevan",
-	"Atlantic/Azores",
-	"Atlantic/Bermuda",
-	"Atlantic/Canary",
-	"Atlantic/Cape_Verde",
-	"Atlantic/Faroe",
-	"Atlantic/Madeira",
-	"Atlantic/Reykjavik",
-	"Atlantic/South_Georgia",
-	"Atlantic/St_Helena",
-	"Atlantic/Stanley",
-	"Australia/Adelaide",
-	"Australia/Brisbane",
-	"Australia/Broken_Hill",
-	"Australia/Darwin",
-	"Australia/Eucla",
-	"Australia/Hobart",
-	"Australia/Lindeman",
-	"Australia/Lord_Howe",
-	"Australia/Melbourne",
-	"Australia/Perth",
-	"Australia/Sydney",
-	"Europe/Amsterdam",
-	"Europe/Andorra",
-	"Europe/Astrakhan",
-	"Europe/Athens",
-	"Europe/Belgrade",
-	"Europe/Berlin",
-	"Europe/Bratislava",
-	"Europe/Brussels",
-	"Europe/Bucharest",
-	"Europe/Budapest",
-	"Europe/Busingen",
-	"Europe/Chisinau",
-	"Europe/Copenhagen",
-	"Europe/Dublin",
-	"Europe/Gibraltar",
-	"Europe/Guernsey",
-	"Europe/Helsinki",
-	"Europe/Isle_of_Man",
-	"Europe/Istanbul",
-	"Europe/Jersey",
-	"Europe/Kaliningrad",
-	"Europe/Kirov",
-	"Europe/Kyiv",
-	"Europe/Lisbon",
-	"Europe/Ljubljana",
-	"Europe/London",
-	"Europe/Luxembourg",
-	"Europe/Madrid",
-	"Europe/Malta",
-	"Europe/Mariehamn",
-	"Europe/Minsk",
-	"Europe/Monaco",
-	"Europe/Moscow",
-	"Europe/Oslo",
-	"Europe/Paris",
-	"Europe/Podgorica",
-	"Europe/Prague",
-	"Europe/Riga",
-	"Europe/Rome",
-	"Europe/Samara",
-	"Europe/San_Marino",
-	"Europe/Sarajevo",
-	"Europe/Saratov",
-	"Europe/Simferopol",
-	"Europe/Skopje",
-	"Europe/Sofia",
-	"Europe/Stockholm",
-	"Europe/Tallinn",
-	"Europe/Tirane",
-	"Europe/Ulyanovsk",
-	"Europe/Vaduz",
-	"Europe/Vatican",
-	"Europe/Vienna",
-	"Europe/Vilnius",
-	"Europe/Volgograd",
-	"Europe/Warsaw",
-	"Europe/Zagreb",
-	"Europe/Zurich",
-	"Indian/Antananarivo",
-	"Indian/Chagos",
-	"Indian/Christmas",
-	"Indian/Cocos",
-	"Indian/Comoro",
-	"Indian/Kerguelen",
-	"Indian/Mahe",
-	"Indian/Maldives",
-	"Indian/Mauritius",
-	"Indian/Mayotte",
-	"Indian/Reunion",
-	"Pacific/Apia",
-	"Pacific/Auckland",
-	"Pacific/Bougainville",
-	"Pacific/Chatham",
-	"Pacific/Chuuk",
-	"Pacific/Easter",
-	"Pacific/Efate",
-	"Pacific/Fakaofo",
-	"Pacific/Fiji",
-	"Pacific/Funafuti",
-	"Pacific/Galapagos",
-	"Pacific/Gambier",
-	"Pacific/Guadalcanal",
-	"Pacific/Guam",
-	"Pacific/Honolulu",
-	"Pacific/Kanton",
-	"Pacific/Kiritimati",
-	"Pacific/Kosrae",
-	"Pacific/Kwajalein",
-	"Pacific/Majuro",
-	"Pacific/Marquesas",
-	"Pacific/Midway",
-	"Pacific/Nauru",
-	"Pacific/Niue",
-	"Pacific/Norfolk",
-	"Pacific/Noumea",
-	"Pacific/Pago_Pago",
-	"Pacific/Palau",
-	"Pacific/Pitcairn",
-	"Pacific/Pohnpei",
-	"Pacific/Port_Moresby",
-	"Pacific/Rarotonga",
-	"Pacific/Saipan",
-	"Pacific/Tahiti",
-	"Pacific/Tarawa",
-	"Pacific/Tongatapu",
-	"Pacific/Wake",
-	"Pacific/Wallis",
-}
-
 var timeCmd = &cobra.Command{
 	Use:   "time",
 	Short: "gets current time in given city",
@@ -439,7 +19,7 @@ var timeCmd = &cobra.Command{
 		if len(args) == 1 {
 			return nil, cobra.ShellCompDirectiveNoFileComp
 		}
-		return getTimeZone(toComplete), cobra.ShellCompDirectiveNoFileComp
+		return getOsTimeZones(toComplete), cobra.ShellCompDirectiveNoFileComp
 	},
 	RunE: func(cmd *cobra.Command, args []string) error {
 		loc, _ := time.LoadLocation(args[0])
@@ -456,18 +36,58 @@ var timeCmd = &cobra.Command{
 	},
 }
 
-func getTimeZone(in string) []string {
-	out := []string{}
-	for _, tz := range timezones {
-		if in == "" {
-			out = append(out, tz)
-		} else {
-			if strings.HasPrefix(tz, in) {
-				out = append(out, tz)
-			}
+func getOsTimeZones(toComplete string) []string {
+	var zones []string
+	zoneDirs := []string{
+		"/usr/share/zoneinfo/",
+		"/usr/share/lib/zoneinfo/",
+		"/usr/lib/locale/TZ/",
+	}
+
+	for _, zd := range zoneDirs {
+		zones = walkTzDir(zd, zones)
+
+		for idx, zone := range zones {
+			zones[idx] = strings.ReplaceAll(zone, zd+"/", "")
 		}
 	}
-	return out
+
+	return zones
+}
+
+func isAlpha(s string) bool {
+	for _, r := range s {
+		if !unicode.IsLetter(r) {
+			return false
+		}
+	}
+	return true
+}
+
+func walkTzDir(path string, zones []string) []string {
+	fileInfos, err := os.ReadDir(path)
+	if err != nil {
+		return zones
+	}
+
+	for _, info := range fileInfos {
+		if info.Name() != strings.ToUpper(info.Name()[:1])+info.Name()[1:] {
+			continue
+		}
+
+		if !isAlpha(info.Name()[:1]) {
+			continue
+		}
+
+		newPath := path + "/" + info.Name()
+
+		if info.IsDir() {
+			zones = walkTzDir(newPath, zones)
+		} else {
+			zones = append(zones, newPath)
+		}
+	}
+	return zones
 }
 
 func init() {