diff --git a/td/telegram/Global.cpp b/td/telegram/Global.cpp
index 810361872..b99dd3c02 100644
--- a/td/telegram/Global.cpp
+++ b/td/telegram/Global.cpp
@@ -104,8 +104,10 @@ Status Global::init(const TdParameters &parameters, ActorId<Td> td, unique_ptr<T
     double diff = saved_diff.diff + default_time_difference;
     if (saved_diff.system_time > system_time) {
       double time_backwards_fix = saved_diff.system_time - system_time;
-      LOG(WARNING) << "Fix system time which went backwards: " << format::as_time(time_backwards_fix) << " "
-                   << tag("saved_system_time", saved_diff.system_time) << tag("system_time", system_time);
+      if (time_backwards_fix > 60) {
+        LOG(WARNING) << "Fix system time which went backwards: " << format::as_time(time_backwards_fix) << " "
+                     << tag("saved_system_time", saved_diff.system_time) << tag("system_time", system_time);
+      }
       diff += time_backwards_fix;
     }
     LOG(DEBUG) << "LOAD: " << tag("server_time_difference", diff);
@@ -118,6 +120,11 @@ Status Global::init(const TdParameters &parameters, ActorId<Td> td, unique_ptr<T
   return Status::OK();
 }
 
+int32 Global::to_unix_time(double server_time) {
+  LOG_CHECK(1.0 <= server_time && server_time <= 2140000000.0) << server_time << " " << Clocks::system();
+  return static_cast<int32>(server_time);
+}
+
 void Global::update_server_time_difference(double diff) {
   if (!server_time_difference_was_updated_ || server_time_difference_ < diff) {
     server_time_difference_ = diff;
diff --git a/td/telegram/Global.h b/td/telegram/Global.h
index 8cd6e3cfa..589fa852a 100644
--- a/td/telegram/Global.h
+++ b/td/telegram/Global.h
@@ -124,9 +124,6 @@ class Global : public ActorContext {
     return *shared_config_;
   }
 
-  double from_server_time(double date) const {
-    return date - get_server_time_difference();
-  }
   double to_server_time(double now) const {
     return now + get_server_time_difference();
   }
@@ -137,10 +134,10 @@ class Global : public ActorContext {
     return to_server_time(Time::now_cached());
   }
   int32 unix_time() const {
-    return static_cast<int32>(server_time());
+    return to_unix_time(server_time());
   }
   int32 unix_time_cached() const {
-    return static_cast<int32>(server_time_cached());
+    return to_unix_time(server_time_cached());
   }
 
   void update_server_time_difference(double diff);
@@ -426,6 +423,8 @@ class Global : public ActorContext {
 
   std::unordered_map<int64, int64> location_access_hashes_;
 
+  static int32 to_unix_time(double server_time);
+
   void do_save_server_time_difference();
 
   void do_close(Promise<> on_finish, bool destroy_flag);