feat: add timezone handling

assets/js/app.js

@@ -25,6 +25,14 @@ import Sortable from "../vendor/sortable"
 
 let csrfToken = document.querySelector("meta[name='csrf-token']").getAttribute("content")
 
+function getBrowserTimezone() {
+  try {
+    return Intl.DateTimeFormat().resolvedOptions().timeZone || null
+  } catch (_e) {
+    return null
+  }
+}
+
 // Hooks for LiveView components
 let Hooks = {}
 
@@ -312,7 +320,10 @@ Hooks.SidebarState = {
 
 let liveSocket = new LiveSocket("/live", Socket, {
   longPollFallbackMs: 2500,
-  params: {_csrf_token: csrfToken},
+  params: {
+    _csrf_token: csrfToken,
+    timezone: getBrowserTimezone()
+  },
   hooks: Hooks
 })