diff --git a/mods/config.go b/mods/config.go
new file mode 100644
index 0000000..edd73d1
--- /dev/null
+++ b/mods/config.go
@@ -0,0 +1,69 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"os"
+	"strings"
+	"time"
+
+	"git.fromouter.space/hamcha/tg"
+)
+
+var tzpath *string
+
+type TZFile map[int64]string
+
+var timezones TZFile
+var tzlocs map[int64]*time.Location
+
+func tz_init() {
+	timezones = make(TZFile)
+	tzlocs = make(map[uint64]*time.Location)
+	file, err := os.Open(*tzpath)
+	if err != nil {
+		return
+	}
+	defer file.Close()
+	err = json.NewDecoder(file).Decode(&timezones)
+	if err != nil {
+		log.Println("[config/tz] WARN: Could not load custom timezones (malformed or unreadable file): " + err.Error())
+		return
+	}
+	for uid, tzname := range timezones {
+		tzlocs[uid], err = time.LoadLocation(tzname)
+		if err != nil {
+			log.Printf("[config/tz] Couldn't load tz data for %d: %s\n", uid, err.Error())
+		}
+	}
+	log.Printf("[config/tz] Loaded %d timezone preferences from %s\n", len(timezones), *tzpath)
+}
+
+func tz_message(broker *tg.Broker, update tg.APIMessage) {
+	if isCommand(update, "tz") {
+		parts := strings.SplitN(*(update.Text), " ", 2)
+		if len(parts) < 2 {
+			broker.SendTextMessage(update.Chat, "<b>Formato:</b> /tz <i>nome_timezone</i>", &update.MessageID)
+			return
+		}
+
+		loc, err := time.LoadLocation(parts[1])
+		if err != nil {
+			broker.SendTextMessage(update.Chat, "<b>Errore:</b> non sono riuscito a trovare una timezone chiamata <b>"+parts[1]+"</b>", &update.MessageID)
+			return
+		}
+
+		tzlocs[update.User.UserID] = loc
+		timezones[update.User.UserID] = parts[1]
+		tz_save()
+	}
+}
+
+func tz_save() error {
+	file, err := os.Create(*tzpath)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	return json.NewEncoder(file).Encode(timezones)
+}
diff --git a/mods/main.go b/mods/main.go
index e0fe494..354f97e 100644
--- a/mods/main.go
+++ b/mods/main.go
@@ -81,6 +81,12 @@ var mods = map[string]Mod{
 		OnInit:      oroscopo_init,
 		OnMessage:   oroscopo_message,
 	},
+	// Config operations
+	"tz": {
+		Description: "Configura timezone personalizzate",
+		OnInit:      tz_init,
+		OnMessage:   tz_message,
+	},
 }
 
 func initmods() {
@@ -158,6 +164,7 @@ func main() {
 	sourcesans = flag.String("sourcesans", "source.ttf", "Path to source.ttf (Source Sans Pro font)")
 	macropath = flag.String("macropath", "macros.json", "Path to macros db (JSON)")
 	remindpath = flag.String("remindpath", "reminders.json", "Path to reminder db (JSON)")
+	remindpath = flag.String("tzpath", "timezones.json", "Path to timezones db (JSON)")
 	proverbi = flag.String("proverbi", "proverbi.txt", "Path to proverbi pairs (separated by /)")
 	talktoken = flag.String("apiai", "@apiai.token", "api.ai token")
 	gapifile = flag.String("gapifile", "gapi.json", "Google API Service Credentials file (for STT)")