diff --git a/src/crashlog.cpp b/src/crashlog.cpp
index f56f21735d..b3360c40ca 100644
--- a/src/crashlog.cpp
+++ b/src/crashlog.cpp
@@ -457,8 +457,9 @@ char *CrashLog::FillCrashLog(char *buffer, const char *last)
 
 	buffer += seprintf(buffer, last, "In game date: %i-%02i-%02i (%i, %i) (DL: %u)\n", _cur_date_ymd.year, _cur_date_ymd.month + 1, _cur_date_ymd.day, _date_fract, _tick_skip_counter, _settings_game.economy.day_length_factor);
 	if (_game_load_time != 0) {
-		buffer += seprintf(buffer, last, "Game loaded at: %i-%02i-%02i (%i, %i), %s",
-				_game_load_cur_date_ymd.year, _game_load_cur_date_ymd.month + 1, _game_load_cur_date_ymd.day, _game_load_date_fract, _game_load_tick_skip_counter, asctime(gmtime(&_game_load_time)));
+		buffer += seprintf(buffer, last, "Game loaded at: %i-%02i-%02i (%i, %i), ",
+				_game_load_cur_date_ymd.year, _game_load_cur_date_ymd.month + 1, _game_load_cur_date_ymd.day, _game_load_date_fract, _game_load_tick_skip_counter);
+		buffer += UTCTime::Format(buffer, last, _game_load_time, "%Y-%m-%d %H:%M:%S");
 	}
 	buffer += seprintf(buffer, last, "\n");
 
@@ -508,10 +509,10 @@ char *CrashLog::FillCrashLog(char *buffer, const char *last)
  */
 char *CrashLog::FillDesyncCrashLog(char *buffer, const char *last, const DesyncExtraInfo &info) const
 {
-	time_t cur_time = time(nullptr);
 	buffer += seprintf(buffer, last, "*** OpenTTD Multiplayer %s Desync Report ***\n\n", _network_server ? "Server" : "Client");
 
-	buffer += seprintf(buffer, last, "Desync at: %s", asctime(gmtime(&cur_time)));
+	buffer += UTCTime::Format(buffer, last, "Desync at: %Y-%m-%d %H:%M:%S (UTC)\n");
+
 	if (!_network_server && info.flags) {
 		auto flag_check = [&](DesyncExtraInfo::Flags flag, const char *str) {
 			return info.flags & flag ? str : "";
@@ -531,8 +532,9 @@ char *CrashLog::FillDesyncCrashLog(char *buffer, const char *last, const DesyncE
 	buffer += seprintf(buffer, last, "In game date: %i-%02i-%02i (%i, %i) (DL: %u), %08X\n",
 			_cur_date_ymd.year, _cur_date_ymd.month + 1, _cur_date_ymd.day, _date_fract, _tick_skip_counter, _settings_game.economy.day_length_factor, _frame_counter);
 	if (_game_load_time != 0) {
-		buffer += seprintf(buffer, last, "Game loaded at: %i-%02i-%02i (%i, %i), %s",
-				_game_load_cur_date_ymd.year, _game_load_cur_date_ymd.month + 1, _game_load_cur_date_ymd.day, _game_load_date_fract, _game_load_tick_skip_counter, asctime(gmtime(&_game_load_time)));
+		buffer += seprintf(buffer, last, "Game loaded at: %i-%02i-%02i (%i, %i), ",
+				_game_load_cur_date_ymd.year, _game_load_cur_date_ymd.month + 1, _game_load_cur_date_ymd.day, _game_load_date_fract, _game_load_tick_skip_counter);
+		buffer += UTCTime::Format(buffer, last, _game_load_time, "%Y-%m-%d %H:%M:%S");
 	}
 	if (!_network_server) {
 		extern Date   _last_sync_date;
@@ -582,10 +584,9 @@ char *CrashLog::FillDesyncCrashLog(char *buffer, const char *last, const DesyncE
  */
 char *CrashLog::FillInconsistencyLog(char *buffer, const char *last, const InconsistencyExtraInfo &info) const
 {
-	time_t cur_time = time(nullptr);
 	buffer += seprintf(buffer, last, "*** OpenTTD Inconsistency Report ***\n\n");
 
-	buffer += seprintf(buffer, last, "Inconsistency at: %s", asctime(gmtime(&cur_time)));
+	buffer += UTCTime::Format(buffer, last, "Inconsistency at: %Y-%m-%d %H:%M:%S (UTC)\n");
 
 #ifdef USE_SCOPE_INFO
 	buffer += WriteScopeLog(buffer, last);
@@ -596,8 +597,9 @@ char *CrashLog::FillInconsistencyLog(char *buffer, const char *last, const Incon
 	buffer += seprintf(buffer, last, "In game date: %i-%02i-%02i (%i, %i) (DL: %u), %08X\n",
 			_cur_date_ymd.year, _cur_date_ymd.month + 1, _cur_date_ymd.day, _date_fract, _tick_skip_counter, _settings_game.economy.day_length_factor, _frame_counter);
 	if (_game_load_time != 0) {
-		buffer += seprintf(buffer, last, "Game loaded at: %i-%02i-%02i (%i, %i), %s",
-				_game_load_cur_date_ymd.year, _game_load_cur_date_ymd.month + 1, _game_load_cur_date_ymd.day, _game_load_date_fract, _game_load_tick_skip_counter, asctime(gmtime(&_game_load_time)));
+		buffer += seprintf(buffer, last, "Game loaded at: %i-%02i-%02i (%i, %i), ",
+				_game_load_cur_date_ymd.year, _game_load_cur_date_ymd.month + 1, _game_load_cur_date_ymd.day, _game_load_date_fract, _game_load_tick_skip_counter);
+		buffer += UTCTime::Format(buffer, last, _game_load_time, "%Y-%m-%d %H:%M:%S");
 	}
 	if (_networking && !_network_server) {
 		extern Date   _last_sync_date;
@@ -812,8 +814,7 @@ bool CrashLog::MakeCrashLog(char *buffer, const char *last)
 	crashlogged = true;
 
 	char *name_buffer_date = this->name_buffer + seprintf(this->name_buffer, lastof(this->name_buffer), "crash-");
-	time_t cur_time = time(nullptr);
-	strftime(name_buffer_date, lastof(this->name_buffer) - name_buffer_date, "%Y%m%dT%H%M%SZ", gmtime(&cur_time));
+	UTCTime::Format(name_buffer_date, lastof(this->name_buffer), "%Y%m%dT%H%M%SZ");
 
 #ifdef DEDICATED
 	if (!_settings_client.gui.keep_all_autosave) {
@@ -912,8 +913,7 @@ bool CrashLog::MakeDesyncCrashLog(const std::string *log_in, std::string *log_ou
 
 	char name_buffer[64];
 	char *name_buffer_date = name_buffer + seprintf(name_buffer, lastof(name_buffer), "desync-%s-", mode);
-	time_t cur_time = time(nullptr);
-	strftime(name_buffer_date, lastof(name_buffer) - name_buffer_date, "%Y%m%dT%H%M%SZ", gmtime(&cur_time));
+	UTCTime::Format(name_buffer_date, lastof(this->name_buffer), "%Y%m%dT%H%M%SZ");
 
 	printf("Desync encountered (%s), generating desync log...\n", mode);
 	char *b = this->FillDesyncCrashLog(buffer, last, info);
@@ -982,8 +982,7 @@ bool CrashLog::MakeInconsistencyLog(const InconsistencyExtraInfo &info) const
 
 	char name_buffer[64];
 	char *name_buffer_date = name_buffer + seprintf(name_buffer, lastof(name_buffer), "inconsistency-");
-	time_t cur_time = time(nullptr);
-	strftime(name_buffer_date, lastof(name_buffer) - name_buffer_date, "%Y%m%dT%H%M%SZ", gmtime(&cur_time));
+	UTCTime::Format(name_buffer_date, lastof(this->name_buffer), "%Y%m%dT%H%M%SZ");
 
 	printf("Inconsistency encountered, generating diagnostics log...\n");
 	this->FillInconsistencyLog(buffer, last, info);
diff --git a/src/os/windows/crashlog_win.cpp b/src/os/windows/crashlog_win.cpp
index 68f9943849..361e5b6d23 100644
--- a/src/os/windows/crashlog_win.cpp
+++ b/src/os/windows/crashlog_win.cpp
@@ -700,8 +700,7 @@ static LONG WINAPI ExceptionHandler(EXCEPTION_POINTERS *ep)
 	CrashLogWindows::current = log;
 	char *buf = log->FillCrashLog(log->crashlog, lastof(log->crashlog));
 	char *name_buffer_date = log->name_buffer + seprintf(log->name_buffer, lastof(log->name_buffer), "crash-");
-	time_t cur_time = time(nullptr);
-	strftime(name_buffer_date, lastof(log->name_buffer) - name_buffer_date, "%Y%m%dT%H%M%SZ", gmtime(&cur_time));
+	UTCTime::Format(name_buffer_date, lastof(this->name_buffer), "%Y%m%dT%H%M%SZ");
 	log->WriteCrashDump(log->crashdump_filename, lastof(log->crashdump_filename));
 	log->AppendDecodedStacktrace(buf, lastof(log->crashlog));
 	log->WriteCrashLog(log->crashlog, log->crashlog_filename, lastof(log->crashlog_filename), log->name_buffer);