Add update of timezone setting

configuration.go

@@ -54,3 +54,9 @@ func (cfg *Configuration) SetTheme(theme string) (err error) {
 	_, err = service.Db.Conn.Exec(`UPDATE public.configuration SET value=$1 WHERE setting='THEME'`, theme)
 	return
 }
+
+func (cfg *Configuration) SetTimezone(tz string) (err error) {
+	cfg.Settings["TIMEZONE"] = tz
+	_, err = service.Db.Conn.Exec(`UPDATE public.configuration SET value=$1 WHERE setting='TIMEZONE'`, tz)
+	return
+}

main.go

@@ -19,6 +19,7 @@ import (
 	"io/fs"
 	"log/slog"
 	"net/http"
+	"net/url"
 	"os"
 	"path"
 	"slices"
@@ -149,6 +150,7 @@ func main() { // {{{
 
 	service.Register("/configuration", false, false, pageConfiguration)
 	service.Register("/configuration/theme", false, false, actionConfigurationTheme)
+	service.Register("/configuration/timezone", false, false, actionConfigurationTimezone)
 	service.Register("/entry/{datapoint}", false, false, actionEntryDatapoint)
 
 	go nodataLoop()
@@ -1021,3 +1023,21 @@ func actionConfigurationTheme(w http.ResponseWriter, r *http.Request, _ *session
 	w.Header().Add("Location", "/configuration")
 	w.WriteHeader(302)
 } // }}}
+func actionConfigurationTimezone(w http.ResponseWriter, r *http.Request, _ *session.T) { // {{{
+	timezone := r.FormValue("timezone")
+
+	_, err := time.LoadLocation(timezone)
+	if err != nil {
+		pageError(w, "/configuration", werr.Wrap(err).Log())
+		return
+	}
+
+	err = smonConfig.SetTimezone(timezone)
+	if err != nil {
+		pageError(w, "/configuration", werr.Wrap(err).Log())
+		return
+	}
+
+	w.Header().Add("Location", "/configuration")
+	w.WriteHeader(302)
+} // }}}

views/pages/configuration.gotmpl

@@ -95,11 +95,17 @@
 	</div>
 
 	<h1>Theme</h1>
-	<form action="/configuration/theme" id="theme-set">
+	<form action="/configuration/theme">
 		<select name="theme" onchange="console.log(this.form.submit())">
 			<option value="default_light" {{ if eq "default_light" .CONFIG.THEME }}selected{{ end }}>Default light</option>
 			<option value="gruvbox"       {{ if eq "gruvbox" .CONFIG.THEME }}selected{{ end }}>Gruvbox</option>
 		</select>
 	</form>
 
+	<h1>Timezone</h1>
+	<form action="/configuration/timezone" method="post">
+		<input name="timezone" type="text" value="{{ .CONFIG.TIMEZONE }}">
+		<button style="margin-left: 8px;">Update</button>
+	</form>
+
 {{ end }}