Remove auto-reboot and make timezone configurable

src/time_manager.cpp

@@ -1,4 +1,5 @@
 #include "time_manager.h"
+#include "config.h"
 #include <time.h>
 
 static bool g_time_synced = false;
@@ -12,15 +13,20 @@ static void note_last_sync(uint32_t epoch) {
   g_last_sync_utc = epoch;
 }
 
+static void ensure_timezone_set() {
+  if (g_tz_set) {
+    return;
+  }
+  setenv("TZ", TIMEZONE_TZ, 1);
+  tzset();
+  g_tz_set = true;
+}
+
 void time_receiver_init(const char *ntp_server_1, const char *ntp_server_2) {
   const char *server1 = (ntp_server_1 && ntp_server_1[0] != '\0') ? ntp_server_1 : "pool.ntp.org";
   const char *server2 = (ntp_server_2 && ntp_server_2[0] != '\0') ? ntp_server_2 : "time.nist.gov";
   configTime(0, 0, server1, server2);
-  if (!g_tz_set) {
-    setenv("TZ", "CET-1CEST,M3.5.0/2,M10.5.0/3", 1);
-    tzset();
-    g_tz_set = true;
-  }
+  ensure_timezone_set();
 }
 
 uint32_t time_get_utc() {
@@ -40,11 +46,7 @@ bool time_is_synced() {
 }
 
 void time_set_utc(uint32_t epoch) {
-  if (!g_tz_set) {
-    setenv("TZ", "CET-1CEST,M3.5.0/2,M10.5.0/3", 1);
-    tzset();
-    g_tz_set = true;
-  }
+  ensure_timezone_set();
   struct timeval tv;
   tv.tv_sec = epoch;
   tv.tv_usec = 0;