Timezone feature (#8185)

* Add supported timezones into config

Remove Timezone list creation in favor of timezone from configs

Add Timezone field to Users table

Clean up format of SupportedTimezones in config

* Remove unwanted change

* Add test for updating user timezone

* Add empty map[string]string if Timezone is null

* Add EnableTimezoneSelection config

* Revert back to map[string]string for ClientConfig

* Refactor SupportedTimezones into timezones.json

* Include timezones.json in TestConfigFlag

* Add timezone api endpoint

* Bump varchar size to 256 and setMaxSize in user_store

* Refactor LoadConfig to LoadConfig and LoadTimezoneConfig

* Remove unnecessary argument in LoadConfig, mail_test

* Add test for timezone endpoint

* Add license header

* Refactor timezones endpoint to system.go

* Add system base route to timezone endpoint

* db timezone upgrade in db v4.9

* Avoid saving SupportedTimezones to config.json

* Add timezonePath support in config

* Remove EnableTimezoneSelection from config

* Use return statement without return parameter

* Refactor test for SupportedTimezones

* Check for supportedTimezone != nil instead of using len

* Decouple SupportedTimezones out of Config

* Fix failing test

* Add LastTeamIconUpdate back in upgrade.go

* Write timezone config in config_flag_test

* Add code fallback for default timezone support

17 files changed, 1397 insertions, 0 deletions

diff --git a/api4/system.go b/api4/system.go
index 7b63afc0b..4ae8ee7b9 100644
--- a/api4/system.go
+++ b/api4/system.go
@@ -17,6 +17,8 @@ import (
 func (api *API) InitSystem() {
 	api.BaseRoutes.System.Handle("/ping", api.ApiHandler(getSystemPing)).Methods("GET")
 
+	api.BaseRoutes.System.Handle("/timezones", api.ApiSessionRequired(getSupportedTimezones)).Methods("GET")
+
 	api.BaseRoutes.ApiRoot.Handle("/config", api.ApiSessionRequired(getConfig)).Methods("GET")
 	api.BaseRoutes.ApiRoot.Handle("/config", api.ApiSessionRequired(updateConfig)).Methods("PUT")
 	api.BaseRoutes.ApiRoot.Handle("/config/reload", api.ApiSessionRequired(configReload)).Methods("POST")
@@ -378,6 +380,18 @@ func getAnalytics(c *Context, w http.ResponseWriter, r *http.Request) {
 	w.Write([]byte(rows.ToJson()))
 }
 
+func getSupportedTimezones(c *Context, w http.ResponseWriter, r *http.Request) {
+	supportedTimezones := c.App.Timezones()
+
+	if supportedTimezones != nil {
+		w.Write([]byte(model.TimezonesToJson(supportedTimezones)))
+		return
+	}
+
+	emptyTimezones := make([]string, 0)
+	w.Write([]byte(model.TimezonesToJson(emptyTimezones)))
+}
+
 func testS3(c *Context, w http.ResponseWriter, r *http.Request) {
 	cfg := model.ConfigFromJson(r.Body)
 	if cfg == nil {
diff --git a/api4/system_test.go b/api4/system_test.go
index 6ef02cbfe..bb3790d4b 100644
--- a/api4/system_test.go
+++ b/api4/system_test.go
@@ -527,3 +527,15 @@ func TestS3TestConnection(t *testing.T) {
 		t.Fatal("should return error ")
 	}
 }
+
+func TestSupportedTimezones(t *testing.T) {
+	th := Setup().InitBasic()
+	defer th.TearDown()
+	Client := th.Client
+
+	supportedTimezonesFromConfig := th.App.Timezones()
+	supportedTimezones, resp := Client.GetSupportedTimezone()
+
+	CheckNoError(t, resp)
+	assert.Equal(t, supportedTimezonesFromConfig, supportedTimezones)
+}
diff --git a/api4/user_test.go b/api4/user_test.go
index f04cd6ab2..359756aeb 100644
--- a/api4/user_test.go
+++ b/api4/user_test.go
@@ -996,6 +996,10 @@ func TestPatchUser(t *testing.T) {
 	patch.Position = new(string)
 	patch.NotifyProps = model.StringMap{}
 	patch.NotifyProps["comment"] = "somethingrandom"
+	patch.Timezone = model.StringMap{}
+	patch.Timezone["useAutomaticTimezone"] = "true"
+	patch.Timezone["automaticTimezone"] = "America/New_York"
+	patch.Timezone["manualTimezone"] = ""
 
 	ruser, resp := Client.PatchUser(user.Id, patch)
 	CheckNoError(t, resp)
@@ -1019,6 +1023,15 @@ func TestPatchUser(t *testing.T) {
 	if ruser.NotifyProps["comment"] != "somethingrandom" {
 		t.Fatal("NotifyProps did not update properly")
 	}
+	if ruser.Timezone["useAutomaticTimezone"] != "true" {
+		t.Fatal("useAutomaticTimezone did not update properly")
+	}
+	if ruser.Timezone["automaticTimezone"] != "America/New_York" {
+		t.Fatal("automaticTimezone did not update properly")
+	}
+	if ruser.Timezone["manualTimezone"] != "" {
+		t.Fatal("manualTimezone did not update properly")
+	}
 
 	patch.Username = model.NewString(th.BasicUser2.Username)
 	_, resp = Client.PatchUser(user.Id, patch)
diff --git a/app/app.go b/app/app.go
index 48e95fb99..6329a80d3 100644
--- a/app/app.go
+++ b/app/app.go
@@ -63,6 +63,8 @@ type App struct {
 	clientLicenseValue atomic.Value
 	licenseListeners   map[string]func()
 
+	timezones atomic.Value
+
 	siteURL string
 
 	newStore func() store.Store
@@ -125,6 +127,9 @@ func New(options ...Option) (outApp *App, outErr error) {
 		return nil, err
 	}
 	app.EnableConfigWatch()
+
+	app.LoadTimezones()
+
 	if err := utils.InitTranslations(app.Config().LocalizationSettings); err != nil {
 		return nil, errors.Wrapf(err, "unable to load Mattermost translation files")
 	}
diff --git a/app/timezone.go b/app/timezone.go
new file mode 100644
index 000000000..84d912da6
--- /dev/null
+++ b/app/timezone.go
@@ -0,0 +1,28 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"github.com/mattermost/mattermost-server/model"
+	"github.com/mattermost/mattermost-server/utils"
+)
+
+func (a *App) Timezones() model.SupportedTimezones {
+	if cfg := a.timezones.Load(); cfg != nil {
+		return cfg.(model.SupportedTimezones)
+	}
+	return model.SupportedTimezones{}
+}
+
+func (a *App) LoadTimezones() {
+	timezonePath := "timezones.json"
+
+	if a.Config().TimezoneSettings.SupportedTimezonesPath != nil && len(*a.Config().TimezoneSettings.SupportedTimezonesPath) > 0 {
+		timezonePath = *a.Config().TimezoneSettings.SupportedTimezonesPath
+	}
+
+	timezoneCfg := utils.LoadTimezones(timezonePath)
+
+	a.timezones.Store(timezoneCfg)
+}
diff --git a/cmd/commands/config_flag_test.go b/cmd/commands/config_flag_test.go
index 8d284ab73..7ea0d5153 100644
--- a/cmd/commands/config_flag_test.go
+++ b/cmd/commands/config_flag_test.go
@@ -11,6 +11,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
+	"encoding/json"
 	"github.com/mattermost/mattermost-server/cmd"
 	"github.com/mattermost/mattermost-server/utils"
 )
@@ -26,6 +27,11 @@ func TestConfigFlag(t *testing.T) {
 	configPath := filepath.Join(dir, "foo.json")
 	require.NoError(t, ioutil.WriteFile(configPath, []byte(config.ToJson()), 0600))
 
+	timezones := utils.LoadTimezones("timezones.json")
+	tzConfigPath := filepath.Join(dir, "timezones.json")
+	timezoneData, _ := json.Marshal(timezones)
+	require.NoError(t, ioutil.WriteFile(tzConfigPath, timezoneData, 0600))
+
 	i18n, ok := utils.FindDir("i18n")
 	require.True(t, ok)
 	require.NoError(t, utils.CopyDir(i18n, filepath.Join(dir, "i18n")))
diff --git a/config/default.json b/config/default.json
index 9993740f6..908604d7e 100644
--- a/config/default.json
+++ b/config/default.json
@@ -211,6 +211,9 @@
         "AllowCustomThemes": true,
         "AllowedThemes": []
     },
+    "TimezoneSettings": {
+        "SupportedTimezonesPath": "timezones.json"
+    },
     "GitLabSettings": {
         "Enable": false,
         "Secret": "",
diff --git a/config/timezones.json b/config/timezones.json
new file mode 100644
index 000000000..146097134
--- /dev/null
+++ b/config/timezones.json
@@ -0,0 +1,596 @@
+[
+    "Africa/Abidjan",
+    "Africa/Accra",
+    "Africa/Addis_Ababa",
+    "Africa/Algiers",
+    "Africa/Asmara",
+    "Africa/Asmera",
+    "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/Timbuktu",
+    "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/ComodRivadavia",
+    "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/Atka",
+    "America/Bahia",
+    "America/Bahia_Banderas",
+    "America/Barbados",
+    "America/Belem",
+    "America/Belize",
+    "America/Blanc-Sablon",
+    "America/Boa_Vista",
+    "America/Bogota",
+    "America/Boise",
+    "America/Buenos_Aires",
+    "America/Cambridge_Bay",
+    "America/Campo_Grande",
+    "America/Cancun",
+    "America/Caracas",
+    "America/Catamarca",
+    "America/Cayenne",
+    "America/Cayman",
+    "America/Chicago",
+    "America/Chihuahua",
+    "America/Coral_Harbour",
+    "America/Cordoba",
+    "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/Ensenada",
+    "America/Fort_Nelson",
+    "America/Fort_Wayne",
+    "America/Fortaleza",
+    "America/Glace_Bay",
+    "America/Godthab",
+    "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/Indianapolis",
+    "America/Inuvik",
+    "America/Iqaluit",
+    "America/Jamaica",
+    "America/Jujuy",
+    "America/Juneau",
+    "America/Kentucky/Louisville",
+    "America/Kentucky/Monticello",
+    "America/Knox_IN",
+    "America/Kralendijk",
+    "America/La_Paz",
+    "America/Lima",
+    "America/Los_Angeles",
+    "America/Louisville",
+    "America/Lower_Princes",
+    "America/Maceio",
+    "America/Managua",
+    "America/Manaus",
+    "America/Marigot",
+    "America/Martinique",
+    "America/Matamoros",
+    "America/Mazatlan",
+    "America/Mendoza",
+    "America/Menominee",
+    "America/Merida",
+    "America/Metlakatla",
+    "America/Mexico_City",
+    "America/Miquelon",
+    "America/Moncton",
+    "America/Monterrey",
+    "America/Montevideo",
+    "America/Montreal",
+    "America/Montserrat",
+    "America/Nassau",
+    "America/New_York",
+    "America/Nipigon",
+    "America/Nome",
+    "America/Noronha",
+    "America/North_Dakota/Beulah",
+    "America/North_Dakota/Center",
+    "America/North_Dakota/New_Salem",
+    "America/Ojinaga",
+    "America/Panama",
+    "America/Pangnirtung",
+    "America/Paramaribo",
+    "America/Phoenix",
+    "America/Port-au-Prince",
+    "America/Port_of_Spain",
+    "America/Porto_Acre",
+    "America/Porto_Velho",
+    "America/Puerto_Rico",
+    "America/Punta_Arenas",
+    "America/Rainy_River",
+    "America/Rankin_Inlet",
+    "America/Recife",
+    "America/Regina",
+    "America/Resolute",
+    "America/Rio_Branco",
+    "America/Rosario",
+    "America/Santa_Isabel",
+    "America/Santarem",
+    "America/Santiago",
+    "America/Santo_Domingo",
+    "America/Sao_Paulo",
+    "America/Scoresbysund",
+    "America/Shiprock",
+    "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/Thunder_Bay",
+    "America/Tijuana",
+    "America/Toronto",
+    "America/Tortola",
+    "America/Vancouver",
+    "America/Virgin",
+    "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/South_Pole",
+    "Antarctica/Syowa",
+    "Antarctica/Troll",
+    "Antarctica/Vostok",
+    "Arctic/Longyearbyen",
+    "Asia/Aden",
+    "Asia/Almaty",
+    "Asia/Amman",
+    "Asia/Anadyr",
+    "Asia/Aqtau",
+    "Asia/Aqtobe",
+    "Asia/Ashgabat",
+    "Asia/Ashkhabad",
+    "Asia/Atyrau",
+    "Asia/Baghdad",
+    "Asia/Bahrain",
+    "Asia/Baku",
+    "Asia/Bangkok",
+    "Asia/Barnaul",
+    "Asia/Beirut",
+    "Asia/Bishkek",
+    "Asia/Brunei",
+    "Asia/Calcutta",
+    "Asia/Chita",
+    "Asia/Choibalsan",
+    "Asia/Chongqing",
+    "Asia/Chungking",
+    "Asia/Colombo",
+    "Asia/Dacca",
+    "Asia/Damascus",
+    "Asia/Dhaka",
+    "Asia/Dili",
+    "Asia/Dubai",
+    "Asia/Dushanbe",
+    "Asia/Famagusta",
+    "Asia/Gaza",
+    "Asia/Harbin",
+    "Asia/Hebron",
+    "Asia/Ho_Chi_Minh",
+    "Asia/Hong_Kong",
+    "Asia/Hovd",
+    "Asia/Irkutsk",
+    "Asia/Istanbul",
+    "Asia/Jakarta",
+    "Asia/Jayapura",
+    "Asia/Jerusalem",
+    "Asia/Kabul",
+    "Asia/Kamchatka",
+    "Asia/Karachi",
+    "Asia/Kashgar",
+    "Asia/Kathmandu",
+    "Asia/Katmandu",
+    "Asia/Khandyga",
+    "Asia/Kolkata",
+    "Asia/Krasnoyarsk",
+    "Asia/Kuala_Lumpur",
+    "Asia/Kuching",
+    "Asia/Kuwait",
+    "Asia/Macao",
+    "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/Qyzylorda",
+    "Asia/Rangoon",
+    "Asia/Riyadh",
+    "Asia/Saigon",
+    "Asia/Sakhalin",
+    "Asia/Samarkand",
+    "Asia/Seoul",
+    "Asia/Shanghai",
+    "Asia/Singapore",
+    "Asia/Srednekolymsk",
+    "Asia/Taipei",
+    "Asia/Tashkent",
+    "Asia/Tbilisi",
+    "Asia/Tehran",
+    "Asia/Tel_Aviv",
+    "Asia/Thimbu",
+    "Asia/Thimphu",
+    "Asia/Tokyo",
+    "Asia/Tomsk",
+    "Asia/Ujung_Pandang",
+    "Asia/Ulaanbaatar",
+    "Asia/Ulan_Bator",
+    "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/Faeroe",
+    "Atlantic/Faroe",
+    "Atlantic/Jan_Mayen",
+    "Atlantic/Madeira",
+    "Atlantic/Reykjavik",
+    "Atlantic/South_Georgia",
+    "Atlantic/St_Helena",
+    "Atlantic/Stanley",
+    "Australia/ACT",
+    "Australia/Adelaide",
+    "Australia/Brisbane",
+    "Australia/Broken_Hill",
+    "Australia/Canberra",
+    "Australia/Currie",
+    "Australia/Darwin",
+    "Australia/Eucla",
+    "Australia/Hobart",
+    "Australia/LHI",
+    "Australia/Lindeman",
+    "Australia/Lord_Howe",
+    "Australia/Melbourne",
+    "Australia/NSW",
+    "Australia/North",
+    "Australia/Perth",
+    "Australia/Queensland",
+    "Australia/South",
+    "Australia/Sydney",
+    "Australia/Tasmania",
+    "Australia/Victoria",
+    "Australia/West",
+    "Australia/Yancowinna",
+    "Brazil/Acre",
+    "Brazil/DeNoronha",
+    "Brazil/East",
+    "Brazil/West",
+    "CET",
+    "CST6CDT",
+    "Canada/Atlantic",
+    "Canada/Central",
+    "Canada/East-Saskatchewan",
+    "Canada/Eastern",
+    "Canada/Mountain",
+    "Canada/Newfoundland",
+    "Canada/Pacific",
+    "Canada/Saskatchewan",
+    "Canada/Yukon",
+    "Chile/Continental",
+    "Chile/EasterIsland",
+    "Cuba",
+    "EET",
+    "EST",
+    "EST5EDT",
+    "Egypt",
+    "Eire",
+    "Etc/GMT",
+    "Etc/GMT+0",
+    "Etc/GMT+1",
+    "Etc/GMT+10",
+    "Etc/GMT+11",
+    "Etc/GMT+12",
+    "Etc/GMT+2",
+    "Etc/GMT+3",
+    "Etc/GMT+4",
+    "Etc/GMT+5",
+    "Etc/GMT+6",
+    "Etc/GMT+7",
+    "Etc/GMT+8",
+    "Etc/GMT+9",
+    "Etc/GMT-0",
+    "Etc/GMT-1",
+    "Etc/GMT-10",
+    "Etc/GMT-11",
+    "Etc/GMT-12",
+    "Etc/GMT-13",
+    "Etc/GMT-14",
+    "Etc/GMT-2",
+    "Etc/GMT-3",
+    "Etc/GMT-4",
+    "Etc/GMT-5",
+    "Etc/GMT-6",
+    "Etc/GMT-7",
+    "Etc/GMT-8",
+    "Etc/GMT-9",
+    "Etc/GMT0",
+    "Etc/Greenwich",
+    "Etc/UCT",
+    "Etc/UTC",
+    "Etc/Universal",
+    "Etc/Zulu",
+    "Europe/Amsterdam",
+    "Europe/Andorra",
+    "Europe/Astrakhan",
+    "Europe/Athens",
+    "Europe/Belfast",
+    "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/Kiev",
+    "Europe/Kirov",
+    "Europe/Lisbon",
+    "Europe/Ljubljana",
+    "Europe/London",
+    "Europe/Luxembourg",
+    "Europe/Madrid",
+    "Europe/Malta",
+    "Europe/Mariehamn",
+    "Europe/Minsk",
+    "Europe/Monaco",
+    "Europe/Moscow",
+    "Europe/Nicosia",
+    "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/Tiraspol",
+    "Europe/Ulyanovsk",
+    "Europe/Uzhgorod",
+    "Europe/Vaduz",
+    "Europe/Vatican",
+    "Europe/Vienna",
+    "Europe/Vilnius",
+    "Europe/Volgograd",
+    "Europe/Warsaw",
+    "Europe/Zagreb",
+    "Europe/Zaporozhye",
+    "Europe/Zurich",
+    "Factory",
+    "GB",
+    "GB-Eire",
+    "GMT",
+    "GMT+0",
+    "GMT-0",
+    "GMT0",
+    "Greenwich",
+    "HST",
+    "Hongkong",
+    "Iceland",
+    "Indian/Antananarivo",
+    "Indian/Chagos",
+    "Indian/Christmas",
+    "Indian/Cocos",
+    "Indian/Comoro",
+    "Indian/Kerguelen",
+    "Indian/Mahe",
+    "Indian/Maldives",
+    "Indian/Mauritius",
+    "Indian/Mayotte",
+    "Indian/Reunion",
+    "Iran",
+    "Israel",
+    "Jamaica",
+    "Japan",
+    "Kwajalein",
+    "Libya",
+    "MET",
+    "MST",
+    "MST7MDT",
+    "Mexico/BajaNorte",
+    "Mexico/BajaSur",
+    "Mexico/General",
+    "NZ",
+    "NZ-CHAT",
+    "Navajo",
+    "PRC",
+    "PST8PDT",
+    "Pacific/Apia",
+    "Pacific/Auckland",
+    "Pacific/Bougainville",
+    "Pacific/Chatham",
+    "Pacific/Chuuk",
+    "Pacific/Easter",
+    "Pacific/Efate",
+    "Pacific/Enderbury",
+    "Pacific/Fakaofo",
+    "Pacific/Fiji",
+    "Pacific/Funafuti",
+    "Pacific/Galapagos",
+    "Pacific/Gambier",
+    "Pacific/Guadalcanal",
+    "Pacific/Guam",
+    "Pacific/Honolulu",
+    "Pacific/Johnston",
+    "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/Ponape",
+    "Pacific/Port_Moresby",
+    "Pacific/Rarotonga",
+    "Pacific/Saipan",
+    "Pacific/Samoa",
+    "Pacific/Tahiti",
+    "Pacific/Tarawa",
+    "Pacific/Tongatapu",
+    "Pacific/Truk",
+    "Pacific/Wake",
+    "Pacific/Wallis",
+    "Pacific/Yap",
+    "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/Pacific-New",
+    "US/Samoa",
+    "UTC",
+    "Universal",
+    "W-SU",
+    "WET",
+    "Zulu"
+]
diff --git a/i18n/en.json b/i18n/en.json
index 42650a868..974334d85 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -3771,6 +3771,18 @@
     "translation": "This team has reached the maximum number of allowed accounts. Contact your systems administrator to set a higher limit."
   },
   {
+  "id": "app.timezones.failed_deserialize.app_error",
+  "translation": "Failed to deserialize Timezone config file={{.Filename}}, err={{.Error}}"
+  },
+  {
+    "id": "app.timezones.load_config.app_error",
+    "translation": "Timezone config file does not exists file={{.Filename}}"
+  },
+  {
+    "id": "app.timezones.read_config.app_error",
+    "translation": "Failed to read Timezone config file={{.Filename}}, err={{.Error}}"
+  },
+  {
     "id": "app.user_access_token.disabled",
     "translation": "Personal access tokens are disabled on this server. Please contact your system administrator for details."
   },
diff --git a/model/client4.go b/model/client4.go
index e7fe2bba0..3bbf7b4cc 100644
--- a/model/client4.go
+++ b/model/client4.go
@@ -314,6 +314,10 @@ func (c *Client4) GetAnalyticsRoute() string {
 	return fmt.Sprintf("/analytics")
 }
 
+func (c *Client4) GetTimezonesRoute() string {
+	return fmt.Sprintf(c.GetSystemRoute() + "/timezones")
+}
+
 func (c *Client4) DoApiGet(url string, etag string) (*http.Response, *AppError) {
 	return c.DoApiRequest(http.MethodGet, c.ApiUrl+url, "", etag)
 }
@@ -3169,6 +3173,18 @@ func (c *Client4) DeleteReaction(reaction *Reaction) (bool, *Response) {
 	}
 }
 
+// Timezone Section
+
+// GetSupportedTimezone returns a page of supported timezones on the system.
+func (c *Client4) GetSupportedTimezone() (SupportedTimezones, *Response) {
+	if r, err := c.DoApiGet(c.GetTimezonesRoute(), ""); err != nil {
+		return nil, BuildErrorResponse(r, err)
+	} else {
+		defer closeBody(r)
+		return TimezonesFromJson(r.Body), BuildResponse(r)
+	}
+}
+
 // Open Graph Metadata Section
 
 // OpenGraph return the open graph metadata for a particular url if the site have the metadata
diff --git a/model/config.go b/model/config.go
index cf26c4205..4e13ca16e 100644
--- a/model/config.go
+++ b/model/config.go
@@ -1700,6 +1700,16 @@ func (s *MessageExportSettings) SetDefaults() {
 	}
 }
 
+type TimezoneSettings struct {
+	SupportedTimezonesPath *string
+}
+
+func (s *TimezoneSettings) SetDefaults() {
+	if s.SupportedTimezonesPath == nil {
+		s.SupportedTimezonesPath = NewString("timezones.json")
+	}
+}
+
 type ConfigFunc func() *Config
 
 type Config struct {
@@ -1733,6 +1743,7 @@ type Config struct {
 	MessageExportSettings MessageExportSettings
 	JobSettings           JobSettings
 	PluginSettings        PluginSettings
+	TimezoneSettings      TimezoneSettings
 }
 
 func (o *Config) Clone() *Config {
@@ -1802,6 +1813,7 @@ func (o *Config) SetDefaults() {
 	o.JobSettings.SetDefaults()
 	o.WebrtcSettings.SetDefaults()
 	o.MessageExportSettings.SetDefaults()
+	o.TimezoneSettings.SetDefaults()
 }
 
 func (o *Config) IsValid() *AppError {
diff --git a/model/timezone.go b/model/timezone.go
new file mode 100644
index 000000000..420b9d2e2
--- /dev/null
+++ b/model/timezone.go
@@ -0,0 +1,628 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type SupportedTimezones []string
+
+func TimezonesToJson(timezoneList []string) string {
+	b, _ := json.Marshal(timezoneList)
+	return string(b)
+}
+
+func TimezonesFromJson(data io.Reader) SupportedTimezones {
+	var timezones SupportedTimezones
+	json.NewDecoder(data).Decode(&timezones)
+	return timezones
+}
+
+func DefaultUserTimezone() map[string]string {
+	defaultTimezone := make(map[string]string)
+	defaultTimezone["useAutomaticTimezone"] = "true"
+	defaultTimezone["automaticTimezone"] = ""
+	defaultTimezone["manualTimezone"] = ""
+
+	return defaultTimezone
+}
+
+var DefaultSupportedTimezones = []string{
+	"Africa/Abidjan",
+	"Africa/Accra",
+	"Africa/Addis_Ababa",
+	"Africa/Algiers",
+	"Africa/Asmara",
+	"Africa/Asmera",
+	"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/Timbuktu",
+	"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/ComodRivadavia",
+	"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/Atka",
+	"America/Bahia",
+	"America/Bahia_Banderas",
+	"America/Barbados",
+	"America/Belem",
+	"America/Belize",
+	"America/Blanc-Sablon",
+	"America/Boa_Vista",
+	"America/Bogota",
+	"America/Boise",
+	"America/Buenos_Aires",
+	"America/Cambridge_Bay",
+	"America/Campo_Grande",
+	"America/Cancun",
+	"America/Caracas",
+	"America/Catamarca",
+	"America/Cayenne",
+	"America/Cayman",
+	"America/Chicago",
+	"America/Chihuahua",
+	"America/Coral_Harbour",
+	"America/Cordoba",
+	"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/Ensenada",
+	"America/Fort_Nelson",
+	"America/Fort_Wayne",
+	"America/Fortaleza",
+	"America/Glace_Bay",
+	"America/Godthab",
+	"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/Indianapolis",
+	"America/Inuvik",
+	"America/Iqaluit",
+	"America/Jamaica",
+	"America/Jujuy",
+	"America/Juneau",
+	"America/Kentucky/Louisville",
+	"America/Kentucky/Monticello",
+	"America/Knox_IN",
+	"America/Kralendijk",
+	"America/La_Paz",
+	"America/Lima",
+	"America/Los_Angeles",
+	"America/Louisville",
+	"America/Lower_Princes",
+	"America/Maceio",
+	"America/Managua",
+	"America/Manaus",
+	"America/Marigot",
+	"America/Martinique",
+	"America/Matamoros",
+	"America/Mazatlan",
+	"America/Mendoza",
+	"America/Menominee",
+	"America/Merida",
+	"America/Metlakatla",
+	"America/Mexico_City",
+	"America/Miquelon",
+	"America/Moncton",
+	"America/Monterrey",
+	"America/Montevideo",
+	"America/Montreal",
+	"America/Montserrat",
+	"America/Nassau",
+	"America/New_York",
+	"America/Nipigon",
+	"America/Nome",
+	"America/Noronha",
+	"America/North_Dakota/Beulah",
+	"America/North_Dakota/Center",
+	"America/North_Dakota/New_Salem",
+	"America/Ojinaga",
+	"America/Panama",
+	"America/Pangnirtung",
+	"America/Paramaribo",
+	"America/Phoenix",
+	"America/Port-au-Prince",
+	"America/Port_of_Spain",
+	"America/Porto_Acre",
+	"America/Porto_Velho",
+	"America/Puerto_Rico",
+	"America/Punta_Arenas",
+	"America/Rainy_River",
+	"America/Rankin_Inlet",
+	"America/Recife",
+	"America/Regina",
+	"America/Resolute",
+	"America/Rio_Branco",
+	"America/Rosario",
+	"America/Santa_Isabel",
+	"America/Santarem",
+	"America/Santiago",
+	"America/Santo_Domingo",
+	"America/Sao_Paulo",
+	"America/Scoresbysund",
+	"America/Shiprock",
+	"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/Thunder_Bay",
+	"America/Tijuana",
+	"America/Toronto",
+	"America/Tortola",
+	"America/Vancouver",
+	"America/Virgin",
+	"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/South_Pole",
+	"Antarctica/Syowa",
+	"Antarctica/Troll",
+	"Antarctica/Vostok",
+	"Arctic/Longyearbyen",
+	"Asia/Aden",
+	"Asia/Almaty",
+	"Asia/Amman",
+	"Asia/Anadyr",
+	"Asia/Aqtau",
+	"Asia/Aqtobe",
+	"Asia/Ashgabat",
+	"Asia/Ashkhabad",
+	"Asia/Atyrau",
+	"Asia/Baghdad",
+	"Asia/Bahrain",
+	"Asia/Baku",
+	"Asia/Bangkok",
+	"Asia/Barnaul",
+	"Asia/Beirut",
+	"Asia/Bishkek",
+	"Asia/Brunei",
+	"Asia/Calcutta",
+	"Asia/Chita",
+	"Asia/Choibalsan",
+	"Asia/Chongqing",
+	"Asia/Chungking",
+	"Asia/Colombo",
+	"Asia/Dacca",
+	"Asia/Damascus",
+	"Asia/Dhaka",
+	"Asia/Dili",
+	"Asia/Dubai",
+	"Asia/Dushanbe",
+	"Asia/Famagusta",
+	"Asia/Gaza",
+	"Asia/Harbin",
+	"Asia/Hebron",
+	"Asia/Ho_Chi_Minh",
+	"Asia/Hong_Kong",
+	"Asia/Hovd",
+	"Asia/Irkutsk",
+	"Asia/Istanbul",
+	"Asia/Jakarta",
+	"Asia/Jayapura",
+	"Asia/Jerusalem",
+	"Asia/Kabul",
+	"Asia/Kamchatka",
+	"Asia/Karachi",
+	"Asia/Kashgar",
+	"Asia/Kathmandu",
+	"Asia/Katmandu",
+	"Asia/Khandyga",
+	"Asia/Kolkata",
+	"Asia/Krasnoyarsk",
+	"Asia/Kuala_Lumpur",
+	"Asia/Kuching",
+	"Asia/Kuwait",
+	"Asia/Macao",
+	"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/Qyzylorda",
+	"Asia/Rangoon",
+	"Asia/Riyadh",
+	"Asia/Saigon",
+	"Asia/Sakhalin",
+	"Asia/Samarkand",
+	"Asia/Seoul",
+	"Asia/Shanghai",
+	"Asia/Singapore",
+	"Asia/Srednekolymsk",
+	"Asia/Taipei",
+	"Asia/Tashkent",
+	"Asia/Tbilisi",
+	"Asia/Tehran",
+	"Asia/Tel_Aviv",
+	"Asia/Thimbu",
+	"Asia/Thimphu",
+	"Asia/Tokyo",
+	"Asia/Tomsk",
+	"Asia/Ujung_Pandang",
+	"Asia/Ulaanbaatar",
+	"Asia/Ulan_Bator",
+	"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/Faeroe",
+	"Atlantic/Faroe",
+	"Atlantic/Jan_Mayen",
+	"Atlantic/Madeira",
+	"Atlantic/Reykjavik",
+	"Atlantic/South_Georgia",
+	"Atlantic/St_Helena",
+	"Atlantic/Stanley",
+	"Australia/ACT",
+	"Australia/Adelaide",
+	"Australia/Brisbane",
+	"Australia/Broken_Hill",
+	"Australia/Canberra",
+	"Australia/Currie",
+	"Australia/Darwin",
+	"Australia/Eucla",
+	"Australia/Hobart",
+	"Australia/LHI",
+	"Australia/Lindeman",
+	"Australia/Lord_Howe",
+	"Australia/Melbourne",
+	"Australia/NSW",
+	"Australia/North",
+	"Australia/Perth",
+	"Australia/Queensland",
+	"Australia/South",
+	"Australia/Sydney",
+	"Australia/Tasmania",
+	"Australia/Victoria",
+	"Australia/West",
+	"Australia/Yancowinna",
+	"Brazil/Acre",
+	"Brazil/DeNoronha",
+	"Brazil/East",
+	"Brazil/West",
+	"CET",
+	"CST6CDT",
+	"Canada/Atlantic",
+	"Canada/Central",
+	"Canada/East-Saskatchewan",
+	"Canada/Eastern",
+	"Canada/Mountain",
+	"Canada/Newfoundland",
+	"Canada/Pacific",
+	"Canada/Saskatchewan",
+	"Canada/Yukon",
+	"Chile/Continental",
+	"Chile/EasterIsland",
+	"Cuba",
+	"EET",
+	"EST",
+	"EST5EDT",
+	"Egypt",
+	"Eire",
+	"Etc/GMT",
+	"Etc/GMT+0",
+	"Etc/GMT+1",
+	"Etc/GMT+10",
+	"Etc/GMT+11",
+	"Etc/GMT+12",
+	"Etc/GMT+2",
+	"Etc/GMT+3",
+	"Etc/GMT+4",
+	"Etc/GMT+5",
+	"Etc/GMT+6",
+	"Etc/GMT+7",
+	"Etc/GMT+8",
+	"Etc/GMT+9",
+	"Etc/GMT-0",
+	"Etc/GMT-1",
+	"Etc/GMT-10",
+	"Etc/GMT-11",
+	"Etc/GMT-12",
+	"Etc/GMT-13",
+	"Etc/GMT-14",
+	"Etc/GMT-2",
+	"Etc/GMT-3",
+	"Etc/GMT-4",
+	"Etc/GMT-5",
+	"Etc/GMT-6",
+	"Etc/GMT-7",
+	"Etc/GMT-8",
+	"Etc/GMT-9",
+	"Etc/GMT0",
+	"Etc/Greenwich",
+	"Etc/UCT",
+	"Etc/UTC",
+	"Etc/Universal",
+	"Etc/Zulu",
+	"Europe/Amsterdam",
+	"Europe/Andorra",
+	"Europe/Astrakhan",
+	"Europe/Athens",
+	"Europe/Belfast",
+	"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/Kiev",
+	"Europe/Kirov",
+	"Europe/Lisbon",
+	"Europe/Ljubljana",
+	"Europe/London",
+	"Europe/Luxembourg",
+	"Europe/Madrid",
+	"Europe/Malta",
+	"Europe/Mariehamn",
+	"Europe/Minsk",
+	"Europe/Monaco",
+	"Europe/Moscow",
+	"Europe/Nicosia",
+	"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/Tiraspol",
+	"Europe/Ulyanovsk",
+	"Europe/Uzhgorod",
+	"Europe/Vaduz",
+	"Europe/Vatican",
+	"Europe/Vienna",
+	"Europe/Vilnius",
+	"Europe/Volgograd",
+	"Europe/Warsaw",
+	"Europe/Zagreb",
+	"Europe/Zaporozhye",
+	"Europe/Zurich",
+	"Factory",
+	"GB",
+	"GB-Eire",
+	"GMT",
+	"GMT+0",
+	"GMT-0",
+	"GMT0",
+	"Greenwich",
+	"HST",
+	"Hongkong",
+	"Iceland",
+	"Indian/Antananarivo",
+	"Indian/Chagos",
+	"Indian/Christmas",
+	"Indian/Cocos",
+	"Indian/Comoro",
+	"Indian/Kerguelen",
+	"Indian/Mahe",
+	"Indian/Maldives",
+	"Indian/Mauritius",
+	"Indian/Mayotte",
+	"Indian/Reunion",
+	"Iran",
+	"Israel",
+	"Jamaica",
+	"Japan",
+	"Kwajalein",
+	"Libya",
+	"MET",
+	"MST",
+	"MST7MDT",
+	"Mexico/BajaNorte",
+	"Mexico/BajaSur",
+	"Mexico/General",
+	"NZ",
+	"NZ-CHAT",
+	"Navajo",
+	"PRC",
+	"PST8PDT",
+	"Pacific/Apia",
+	"Pacific/Auckland",
+	"Pacific/Bougainville",
+	"Pacific/Chatham",
+	"Pacific/Chuuk",
+	"Pacific/Easter",
+	"Pacific/Efate",
+	"Pacific/Enderbury",
+	"Pacific/Fakaofo",
+	"Pacific/Fiji",
+	"Pacific/Funafuti",
+	"Pacific/Galapagos",
+	"Pacific/Gambier",
+	"Pacific/Guadalcanal",
+	"Pacific/Guam",
+	"Pacific/Honolulu",
+	"Pacific/Johnston",
+	"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/Ponape",
+	"Pacific/Port_Moresby",
+	"Pacific/Rarotonga",
+	"Pacific/Saipan",
+	"Pacific/Samoa",
+	"Pacific/Tahiti",
+	"Pacific/Tarawa",
+	"Pacific/Tongatapu",
+	"Pacific/Truk",
+	"Pacific/Wake",
+	"Pacific/Wallis",
+	"Pacific/Yap",
+	"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/Pacific-New",
+	"US/Samoa",
+	"UTC",
+	"Universal",
+	"W-SU",
+	"WET",
+	"Zulu",
+}
diff --git a/model/user.go b/model/user.go
index f64275c83..0f215b0e7 100644
--- a/model/user.go
+++ b/model/user.go
@@ -71,6 +71,7 @@ type User struct {
 	LastPictureUpdate  int64     `json:"last_picture_update,omitempty"`
 	FailedAttempts     int       `json:"failed_attempts,omitempty"`
 	Locale             string    `json:"locale"`
+	Timezone           StringMap `json:"timezone"`
 	MfaActive          bool      `json:"mfa_active,omitempty"`
 	MfaSecret          string    `json:"mfa_secret,omitempty"`
 	LastActivityAt     int64     `db:"-" json:"last_activity_at,omitempty"`
@@ -86,6 +87,7 @@ type UserPatch struct {
 	Props       StringMap `json:"props,omitempty"`
 	NotifyProps StringMap `json:"notify_props,omitempty"`
 	Locale      *string   `json:"locale"`
+	Timezone    StringMap `json:"timezone"`
 }
 
 type UserAuth struct {
@@ -208,6 +210,10 @@ func (u *User) PreSave() {
 		u.SetDefaultNotifications()
 	}
 
+	if u.Timezone == nil {
+		u.Props = make(map[string]string)
+	}
+
 	if len(u.Password) > 0 {
 		u.Password = HashPassword(u.Password)
 	}
@@ -302,6 +308,10 @@ func (u *User) Patch(patch *UserPatch) {
 	if patch.Locale != nil {
 		u.Locale = *patch.Locale
 	}
+
+	if patch.Timezone != nil {
+		u.Timezone = patch.Timezone
+	}
 }
 
 // ToJson convert a User to a json string
diff --git a/store/sqlstore/upgrade.go b/store/sqlstore/upgrade.go
index 58de85c7f..d528e464d 100644
--- a/store/sqlstore/upgrade.go
+++ b/store/sqlstore/upgrade.go
@@ -4,6 +4,7 @@
 package sqlstore
 
 import (
+	"encoding/json"
 	"os"
 	"strings"
 	"time"
@@ -376,6 +377,12 @@ func UpgradeDatabaseToVersion49(sqlStore SqlStore) {
 	//TODO: Uncomment the following condition when version 4.9.0 is released
 	//if shouldPerformUpgrade(sqlStore, VERSION_4_8_0, VERSION_4_9_0) {
 	sqlStore.CreateColumnIfNotExists("Teams", "LastTeamIconUpdate", "bigint", "bigint", "0")
+	defaultTimezone := model.DefaultUserTimezone()
+	defaultTimezoneValue, err := json.Marshal(defaultTimezone)
+	if err != nil {
+		l4g.Critical(err)
+	}
+	sqlStore.CreateColumnIfNotExists("Users", "Timezone", "varchar(256)", "varchar(256)", string(defaultTimezoneValue))
 	//	saveSchemaVersion(sqlStore, VERSION_4_9_0)
 	//}
 }
diff --git a/store/sqlstore/user_store.go b/store/sqlstore/user_store.go
index 5e84af930..f4ed3e400 100644
--- a/store/sqlstore/user_store.go
+++ b/store/sqlstore/user_store.go
@@ -79,6 +79,7 @@ func NewSqlUserStore(sqlStore SqlStore, metrics einterfaces.MetricsInterface) st
 		table.ColMap("Locale").SetMaxSize(5)
 		table.ColMap("MfaSecret").SetMaxSize(128)
 		table.ColMap("Position").SetMaxSize(128)
+		table.ColMap("Timezone").SetMaxSize(256)
 	}
 
 	return us
diff --git a/utils/config_test.go b/utils/config_test.go
index 5809422f1..6d6181a3d 100644
--- a/utils/config_test.go
+++ b/utils/config_test.go
@@ -21,6 +21,15 @@ func TestConfig(t *testing.T) {
 	InitTranslations(cfg.LocalizationSettings)
 }
 
+func TestTimezoneConfig(t *testing.T) {
+	TranslationsPreInit()
+	supportedTimezones := LoadTimezones("timezones.json")
+	assert.Equal(t, len(supportedTimezones) > 0, true)
+
+	supportedTimezones2 := LoadTimezones("timezones_file_does_not_exists.json")
+	assert.Equal(t, len(supportedTimezones2) > 0, true)
+}
+
 func TestFindConfigFile(t *testing.T) {
 	dir, err := ioutil.TempDir("", "")
 	require.NoError(t, err)
diff --git a/utils/timezone.go b/utils/timezone.go
new file mode 100644
index 000000000..ea5f15140
--- /dev/null
+++ b/utils/timezone.go
@@ -0,0 +1,25 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package utils
+
+import (
+	"encoding/json"
+	"io/ioutil"
+
+	"github.com/mattermost/mattermost-server/model"
+)
+
+func LoadTimezones(fileName string) model.SupportedTimezones {
+	var supportedTimezones model.SupportedTimezones
+
+	if timezoneFile := FindConfigFile(fileName); timezoneFile == "" {
+		return model.DefaultSupportedTimezones
+	} else if raw, err := ioutil.ReadFile(timezoneFile); err != nil {
+		return model.DefaultSupportedTimezones
+	} else if err := json.Unmarshal(raw, &supportedTimezones); err != nil {
+		return model.DefaultSupportedTimezones
+	} else {
+		return supportedTimezones
+	}
+}