Core/Misc: Replace time(NULL) with GameTime::GetGameTime()

(cherry picked from commit 12701cb0c6)

 Conflicts:
	src/server/game/Achievements/AchievementMgr.cpp
	src/server/game/AuctionHouse/AuctionHouseMgr.cpp
	src/server/game/AuctionHouseBot/AuctionHouseBotBuyer.cpp
	src/server/game/AuctionHouseBot/AuctionHouseBotSeller.cpp
	src/server/game/Battlefield/Battlefield.cpp
	src/server/game/Battlefield/Zones/BattlefieldWG.cpp
	src/server/game/Battlegrounds/BattlegroundMgr.cpp
	src/server/game/Calendar/CalendarMgr.h
	src/server/game/DungeonFinding/LFGQueue.cpp
	src/server/game/Entities/Corpse/Corpse.cpp
	src/server/game/Entities/Creature/Creature.cpp
	src/server/game/Entities/Item/Item.cpp
	src/server/game/Entities/Pet/Pet.cpp
	src/server/game/Entities/Player/Player.cpp
	src/server/game/Entities/Unit/Unit.cpp
	src/server/game/Globals/ObjectMgr.cpp
	src/server/game/Grids/ObjectGridLoader.cpp
	src/server/game/Guilds/Guild.cpp
	src/server/game/Handlers/AuctionHouseHandler.cpp
	src/server/game/Handlers/BattlefieldHandler.cpp
	src/server/game/Handlers/CalendarHandler.cpp
	src/server/game/Handlers/CharacterHandler.cpp
	src/server/game/Handlers/ChatHandler.cpp
	src/server/game/Handlers/LFGHandler.cpp
	src/server/game/Handlers/MailHandler.cpp
	src/server/game/Handlers/MiscHandler.cpp
	src/server/game/Handlers/MovementHandler.cpp
	src/server/game/Handlers/PetHandler.cpp
	src/server/game/Handlers/QueryHandler.cpp
	src/server/game/Handlers/TicketHandler.cpp
	src/server/game/Instances/InstanceSaveMgr.cpp
	src/server/game/Server/WorldSession.cpp
	src/server/game/Server/WorldSocket.cpp
	src/server/game/Spells/Auras/SpellAuras.cpp
	src/server/game/Tickets/TicketMgr.cpp
	src/server/game/Tickets/TicketMgr.h
	src/server/game/World/World.cpp
	src/server/scripts/Commands/cs_gobject.cpp
	src/server/scripts/Commands/cs_instance.cpp
	src/server/scripts/Commands/cs_list.cpp
	src/server/scripts/Northrend/zone_wintergrasp.cpp
	src/server/scripts/Spells/spell_item.cpp

src/server/game/Handlers/MovementHandler.cpp

@@ -186,7 +186,7 @@ void WorldSession::HandleMoveWorldportAck()
             {
                 if (time_t timeReset = sInstanceSaveMgr->GetResetTimeFor(mEntry->ID, diff))
                 {
-                    uint32 timeleft = uint32(timeReset - time(nullptr));
+                    uint32 timeleft = uint32(timeReset - GameTime::GetGameTime());
                     GetPlayer()->SendInstanceResetWarning(mEntry->ID, diff, timeleft, true);
                 }
             }