diff --git a/user.js b/user.js
index 35548ba..074f8d6 100644
--- a/user.js
+++ b/user.js
@@ -1502,12 +1502,12 @@ user_pref("mail.chat.notification_info", 2);
 /** CALENDAR ***/
 /* 9312: Set calendar timezone to avoid system detection [SETUP-INSTALL]
  * By default, extensive system detection is performed to find current timezone (if OS supports it).
- * Disable system detection and set timezone to "UTC".
+ * Disable system detection and set timezone to UTC.
  * You may also directly set it to your timezone, i.e. "Pacific/Fakaofo"
  * [SETTING] Calendar > Calendar > Set timezone manually / Timezone
  * [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1606357 ***/
 user_pref("calendar.timezone.useSystemTimezone", false);
-user_pref("calendar.timezone.local", "UTC");  // [DEFAULT: ""]
+user_pref("calendar.timezone.local", "Etc/UTC");  // [DEFAULT: ""]
 /* 9313: Disable calendar service performing event "extraction" from email content ***/
    // user_pref("calendar.extract.service.enabled", false);  // [DEFAULT: false]
 /* 9314: Show missed reminders (disabled by default since ESR140.0)