fix(time): apply timezone before lcd startup

components/platform/include/platform.h

@@ -237,12 +237,15 @@ esp_err_t platform_storage_erase(const char *ns, const char *key);
 /**
  * @brief Wall-clock time synchronization (SNTP) primitives.
  *
+ * - `platform_time_set_timezone()` applies the process-local POSIX time zone
+ *   without starting SNTP. Call it during boot before local time is rendered.
  * - `platform_time_sync_start()` is idempotent: it sets the process time zone
  *   (`posix_tz`, e.g. "CST-8"; ignored when NULL/empty) on every call and
  *   starts the SNTP client once. Must be called after the network is up.
  * - `platform_time_is_synced()` reports whether the system clock has advanced
  *   past a sane epoch lower bound (i.e. SNTP has set the time at least once).
  */
+esp_err_t platform_time_set_timezone(const char *posix_tz);
 esp_err_t platform_time_sync_start(const char *sntp_server, const char *posix_tz);
 bool platform_time_is_synced(void);
 

components/platform/src/runtime/platform_time.c

@@ -23,11 +23,27 @@ static const char *TAG = "platform_time";
 static bool s_sntp_started;
 static portMUX_TYPE s_time_lock = portMUX_INITIALIZER_UNLOCKED;
 
+esp_err_t platform_time_set_timezone(const char *posix_tz)
+{
+    if (posix_tz == NULL || posix_tz[0] == '\0') {
+        return ESP_ERR_INVALID_ARG;
+    }
+    if (setenv("TZ", posix_tz, 1) != 0) {
+        ESP_LOGE(TAG, "Set time zone failed (tz=%s)", posix_tz);
+        return ESP_FAIL;
+    }
+    tzset();
+    ESP_LOGI(TAG, "Local time zone applied (tz=%s)", posix_tz);
+    return ESP_OK;
+}
+
 esp_err_t platform_time_sync_start(const char *sntp_server, const char *posix_tz)
 {
     if (posix_tz != NULL && posix_tz[0] != '\0') {
-        setenv("TZ", posix_tz, 1);
-        tzset();
+        esp_err_t timezone_err = platform_time_set_timezone(posix_tz);
+        if (timezone_err != ESP_OK) {
+            return timezone_err;
+        }
     }
 
     portENTER_CRITICAL(&s_time_lock);