diff --git a/model/time.go b/model/time.go
index b7dc3d2..baf3ce6 100644
--- a/model/time.go
+++ b/model/time.go
@@ -12,12 +12,12 @@ func MakeTimeNow() Time {
     return Time(time.Now().UTC())
 }
 
-func (self Time) String() string {
-    return time.Time(self).String()
+func (self Time) AsUTCString() string {
+    return time.Time(self).Format(time.RFC3339)
 }
 
 func (self Time) Value() (sqldriver.Value, error) {
-    return time.Time(self).Format(time.RFC3339), nil
+    return self.AsUTCString(), nil
 }
 
 func (self *Time) Scan(value any) error {
diff --git a/run.bat b/run.bat
new file mode 100644
index 0000000..1697457
--- /dev/null
+++ b/run.bat
@@ -0,0 +1,2 @@
+templ generate
+go run .
diff --git a/static/ui-components.js b/static/ui-components.js
new file mode 100644
index 0000000..b825f23
--- /dev/null
+++ b/static/ui-components.js
@@ -0,0 +1,65 @@
+class LocalDate extends HTMLElement {
+    connectedCallback() {
+        let utcDate = new Date(this.innerText);
+        this.innerText = utcDate.toLocaleString();
+    }
+}
+customElements.define("local-date", LocalDate);
+
+class TimerCountdown extends HTMLElement {
+    startTime;
+    endTime;
+    refreshInterval = null;
+
+    refreshCountdown() {
+        let diff = Math.floor((this.endTime - this.startTime) / 1000);
+        if (diff <= 0) {
+            this.innerText = "Finished";
+            return;
+        }
+
+        let days = Math.floor(diff / (24 * 60 * 60));
+        diff -= days * 24 * 60 * 60;
+        let hours = Math.floor(diff / (60 * 60));
+        diff -= hours * 60 * 60;
+        let minutes = Math.floor(diff / 60);
+        diff -= minutes * 60;
+        let seconds = diff;
+
+        let newText = "";
+        if (days > 0) {
+            newText += `${days} days, `;
+        }
+        newText += `${hours.toFixed(0).padStart(2, "0")}:`
+            + `${minutes.toFixed(0).padStart(2, "0")}:`
+            + `${seconds.toFixed(0).padStart(2, "0")}`;
+
+        this.innerText = newText;
+    }
+
+    refreshCountdownNow() {
+        this.startTime = (new Date()).getTime();
+        this.refreshCountdown();
+    }
+
+    connectedCallback() {
+        this.endTime = (new Date(this.getAttribute("end"))).getTime();
+        if (this.hasAttribute("start")) {
+            this.startTime = (new Date(this.getAttribute("start"))).getTime();
+            this.refreshCountdown();
+        }
+        else {
+            this.startTime = (new Date()).getTime();
+            this.refreshCountdown();
+            this.refreshInterval = setInterval(this.refreshCountdownNow.bind(this), 1000);
+        }
+    }
+
+    disconnectedCallback() {
+        if (this.refreshInterval !== null) {
+            clearInterval(this.refreshInterval);
+        }
+    }
+}
+customElements.define("timer-countdown", TimerCountdown);
+
diff --git a/timer.go b/timer.go
index d5e0a67..324f846 100644
--- a/timer.go
+++ b/timer.go
@@ -6,6 +6,8 @@ import (
     "database/sql"
     "context"
     "strings"
+    "time"
+    "strconv"
 
     _ "github.com/mattn/go-sqlite3"
 
@@ -13,11 +15,12 @@ import (
     "stevenlr.com/timer/model"
 )
 
-func insertTimer(tx *sql.Tx, name string) error {
+func insertTimer(tx *sql.Tx, name string, seconds int) error {
     now := model.MakeTimeNow()
+    end := model.Time(time.Time(now).Add(time.Duration(seconds) * time.Second))
     id := model.MakeUUID()
     _, err := tx.Exec(`
-        INSERT INTO Timer VALUES ($1, $2, $3, $4)`, id, name, now, now);
+        INSERT INTO Timer VALUES ($1, $2, $3, $4)`, id, name, now, end);
     return err
 }
 
@@ -37,10 +40,10 @@ func initializeDatabase(db *sql.DB) error {
     `)
     if err != nil { return err }
 
-    err = insertTimer(tx, "My timer")
+    err = insertTimer(tx, "My timer", 600)
     if err != nil { return err }
 
-    err = insertTimer(tx, "My timer2")
+    err = insertTimer(tx, "My timer2", 600)
     if err != nil { return err }
 
     return tx.Commit()
@@ -123,6 +126,20 @@ func (server *MyServer) handleDeleteTimer(w http.ResponseWriter, r *http.Request
 func (server* MyServer) handlePutTimer(w http.ResponseWriter, r *http.Request) {
     timerName := strings.TrimSpace(r.FormValue("timerName"))
 
+    days, err := strconv.ParseInt(strings.TrimSpace(r.FormValue("days")), 10, 32)
+    if err != nil {
+        w.WriteHeader(http.StatusBadRequest)
+        view.TimerCreateForm(timerName, "Error parsing days").Render(context.Background(), w)
+        return
+    }
+
+    hours, err := strconv.ParseInt(strings.TrimSpace(r.FormValue("hours")), 10, 32)
+    if err != nil {
+        w.WriteHeader(http.StatusBadRequest)
+        view.TimerCreateForm(timerName, "Error parsing hours").Render(context.Background(), w)
+        return
+    }
+
     tx, err := server.db.Begin()
     if err != nil {
         w.WriteHeader(http.StatusInternalServerError)
@@ -137,7 +154,7 @@ func (server* MyServer) handlePutTimer(w http.ResponseWriter, r *http.Request) {
         return
     }
 
-    err = insertTimer(tx, timerName)
+    err = insertTimer(tx, timerName, int(((max(days, 0) * 24) + max(hours, 0)) * 3600))
     if err != nil {
         w.WriteHeader(http.StatusInternalServerError)
         view.TimerCreateForm(timerName, "Internal server error").Render(context.Background(), w)
diff --git a/view/main.templ b/view/main.templ
index b6d94d8..64a365c 100644
--- a/view/main.templ
+++ b/view/main.templ
@@ -6,6 +6,7 @@ templ Main(contents templ.Component) {
     <head>
         <title>Cool timer app</title>
         <link rel="stylesheet" href="/static/style.css" />
+        <script type="module" src="/static/ui-components.js"></script>
         <script src="/static/htmx.min.js"></script>
         <script src="/static/response-targets.js"></script>
     </head>
diff --git a/view/main_templ.go b/view/main_templ.go
index 109be9c..5b3831d 100644
--- a/view/main_templ.go
+++ b/view/main_templ.go
@@ -23,7 +23,7 @@ func Main(contents templ.Component) templ.Component {
 			templ_7745c5c3_Var1 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
-		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("<!doctype html><html><head><title>Cool timer app</title><link rel=\"stylesheet\" href=\"/static/style.css\"><script src=\"/static/htmx.min.js\"></script><script src=\"/static/response-targets.js\"></script></head><body hx-boost=\"true\" hx-ext=\"response-targets\">")
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("<!doctype html><html><head><title>Cool timer app</title><link rel=\"stylesheet\" href=\"/static/style.css\"><script type=\"module\" src=\"/static/ui-components.js\"></script><script src=\"/static/htmx.min.js\"></script><script src=\"/static/response-targets.js\"></script></head><body hx-boost=\"true\" hx-ext=\"response-targets\">")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
diff --git a/view/timer.templ b/view/timer.templ
index fa258eb..8d20933 100644
--- a/view/timer.templ
+++ b/view/timer.templ
@@ -7,6 +7,20 @@ import (
 templ TimerView(timer model.Timer) {
     <h1>This is timer { timer.Name } </h1>
     <p><a href="/">Back to list</a></p>
-    <p>Start time: { timer.StartTime.String() }</p>
-    <p>End time: { timer.EndTime.String() }</p>
+    <p>Start time: <local-date>{ timer.StartTime.AsUTCString() }</local-date></p>
+    <p>End time: <local-date>{ timer.EndTime.AsUTCString() }</local-date></p>
+    <p>
+        Total time:
+        <timer-countdown
+            start={ timer.StartTime.AsUTCString() }
+            end={ timer.EndTime.AsUTCString() }
+        ></timer-countdown>
+    </p>
+    <p>
+        Remaining time:
+        <timer-countdown
+            end={ timer.EndTime.AsUTCString() }
+        ></timer-countdown>
+    </p>
 }
+
diff --git a/view/timer_templ.go b/view/timer_templ.go
index 7fee7d3..55e5346 100644
--- a/view/timer_templ.go
+++ b/view/timer_templ.go
@@ -40,33 +40,72 @@ func TimerView(timer model.Timer) templ.Component {
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("</h1><p><a href=\"/\">Back to list</a></p><p>Start time: ")
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("</h1><p><a href=\"/\">Back to list</a></p><p>Start time: <local-date>")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var3 string
-		templ_7745c5c3_Var3, templ_7745c5c3_Err = templ.JoinStringErrs(timer.StartTime.String())
+		templ_7745c5c3_Var3, templ_7745c5c3_Err = templ.JoinStringErrs(timer.StartTime.AsUTCString())
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `view\timer.templ`, Line: 10, Col: 45}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `view\timer.templ`, Line: 10, Col: 62}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var3))
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("</p><p>End time: ")
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("</local-date></p><p>End time: <local-date>")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var4 string
-		templ_7745c5c3_Var4, templ_7745c5c3_Err = templ.JoinStringErrs(timer.EndTime.String())
+		templ_7745c5c3_Var4, templ_7745c5c3_Err = templ.JoinStringErrs(timer.EndTime.AsUTCString())
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `view\timer.templ`, Line: 11, Col: 41}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `view\timer.templ`, Line: 11, Col: 58}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var4))
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("</p>")
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("</local-date></p><p>Total time:\r <timer-countdown start=\"")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		var templ_7745c5c3_Var5 string
+		templ_7745c5c3_Var5, templ_7745c5c3_Err = templ.JoinStringErrs(timer.StartTime.AsUTCString())
+		if templ_7745c5c3_Err != nil {
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `view\timer.templ`, Line: 15, Col: 49}
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var5))
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("\" end=\"")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		var templ_7745c5c3_Var6 string
+		templ_7745c5c3_Var6, templ_7745c5c3_Err = templ.JoinStringErrs(timer.EndTime.AsUTCString())
+		if templ_7745c5c3_Err != nil {
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `view\timer.templ`, Line: 16, Col: 45}
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var6))
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("\"></timer-countdown></p><p>Remaining time:\r <timer-countdown end=\"")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		var templ_7745c5c3_Var7 string
+		templ_7745c5c3_Var7, templ_7745c5c3_Err = templ.JoinStringErrs(timer.EndTime.AsUTCString())
+		if templ_7745c5c3_Err != nil {
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `view\timer.templ`, Line: 22, Col: 45}
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var7))
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("\"></timer-countdown></p>")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
diff --git a/view/timers_list.templ b/view/timers_list.templ
index 2d71a52..92d7013 100644
--- a/view/timers_list.templ
+++ b/view/timers_list.templ
@@ -25,6 +25,8 @@ templ TimerCreateForm(timerName string, err string) {
     >
         <p>
             <input type="text" name="timerName" value={ timerName } placeholder="Name" />
+            <input type="number" name="days" placeholder="Days" style="width: 5em;" />
+            <input type="number" name="hours" placeholder="Hours" style="width: 5em;" />
             <button type="submit">Create</button>
         </p>
         if err != "" {
diff --git a/view/timers_list_templ.go b/view/timers_list_templ.go
index af4922d..955ab9a 100644
--- a/view/timers_list_templ.go
+++ b/view/timers_list_templ.go
@@ -100,7 +100,7 @@ func TimerCreateForm(timerName string, err string) templ.Component {
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("\" placeholder=\"Name\"> <button type=\"submit\">Create</button></p>")
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString("\" placeholder=\"Name\"> <input type=\"number\" name=\"days\" placeholder=\"Days\" style=\"width: 5em;\"> <input type=\"number\" name=\"hours\" placeholder=\"Hours\" style=\"width: 5em;\"> <button type=\"submit\">Create</button></p>")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -112,7 +112,7 @@ func TimerCreateForm(timerName string, err string) templ.Component {
 			var templ_7745c5c3_Var7 string
 			templ_7745c5c3_Var7, templ_7745c5c3_Err = templ.JoinStringErrs(err)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `view\timers_list.templ`, Line: 31, Col: 34}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `view\timers_list.templ`, Line: 33, Col: 34}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var7))
 			if templ_7745c5c3_Err != nil {