Include dates and tick counters in state checksum

src/network/network.cpp

@@ -1130,6 +1130,7 @@ const char *GetSyncRecordEventName(NetworkSyncRecordEvents event)
 		"TREE",
 		"STATION",
 		"INDUSTRY",
+		"PRE_DATES",
 		"PRE_COMPANY_STATE",
 		"VEH_PERIODIC",
 		"VEH_LOAD_UNLOAD",

src/network/network_sync.h

@@ -31,6 +31,7 @@ enum NetworkSyncRecordEvents : uint32_t {
 	NSRE_TREE,
 	NSRE_STATION,
 	NSRE_INDUSTRY,
+	NSRE_PRE_DATES,
 	NSRE_PRE_COMPANY_STATE,
 	NSRE_VEH_PERIODIC,
 	NSRE_VEH_LOAD_UNLOAD,

src/openttd.cpp

@@ -2271,6 +2271,17 @@ void StateGameLoop()
 		NewsLoop();
 
 		if (_networking) {
+			RecordSyncEvent(NSRE_PRE_DATES);
+			UpdateStateChecksum(_tick_counter);
+			UpdateStateChecksum(_scaled_tick_counter);
+			UpdateStateChecksum(_state_ticks.base());
+			UpdateStateChecksum(CalTime::CurDate().base());
+			UpdateStateChecksum(CalTime::CurDateFract());
+			UpdateStateChecksum(CalTime::CurSubDateFract());
+			UpdateStateChecksum(EconTime::CurDate().base());
+			UpdateStateChecksum(EconTime::CurDateFract());
+			UpdateStateChecksum(TickSkipCounter());
+
 			RecordSyncEvent(NSRE_PRE_COMPANY_STATE);
 			for (Company *c : Company::Iterate()) {
 				DEBUG_UPDATESTATECHECKSUM("Company: %u, Money: " OTTD_PRINTF64, c->index, (int64_t)c->money);

src/settings.cpp

@@ -1278,6 +1278,7 @@ static void ChangeTimekeepingUnits(int32_t)
 
 	UpdateEffectiveDayLengthFactor();
 	SetupTickRate();
+	UpdateTimeSettings(0);
 }
 
 /**