Core/Calendar: Improve calendar timezone handling

Improve calendar timezone handling by at least creating events with the correct time if both client and server are in the same timezone. There is currently no information received from the client about in which timezone it is.

(cherry picked from commit b33934f6ce9b0227597c712dd6a76b7ed49deea3)

src/common/Utilities/Util.cpp

@@ -77,6 +77,15 @@ struct tm* localtime_r(time_t const* time, struct tm *result)
 }
 #endif
 
+time_t LocalTimeToUTCTime(time_t time)
+{
+#if (defined(WIN32) || defined(_WIN32) || defined(__WIN32__))
+    return time + _timezone;
+#else
+    return time + timezone;
+#endif
+}
+
 std::string secsToTimeString(uint64 timeInSecs, bool shortText, bool hoursOnly)
 {
     uint64 secs    = timeInSecs % MINUTE;

src/common/Utilities/Util.h

@@ -59,6 +59,7 @@ private:
 TC_COMMON_API int64 MoneyStringToMoney(std::string const& moneyString);
 
 TC_COMMON_API struct tm* localtime_r(time_t const* time, struct tm *result);
+TC_COMMON_API time_t LocalTimeToUTCTime(time_t time);
 
 TC_COMMON_API std::string secsToTimeString(uint64 timeInSecs, bool shortText = false, bool hoursOnly = false);
 TC_COMMON_API uint32 TimeStringToSecs(std::string const& timestring);

src/server/game/Handlers/CalendarHandler.cpp

@@ -50,6 +50,7 @@ Copied events should probably have a new owner
 #include "Opcodes.h"
 #include "Player.h"
 #include "SocialMgr.h"
+#include "Util.h"
 #include "World.h"
 
 void WorldSession::HandleCalendarGetCalendar(WorldPackets::Calendar::CalendarGetCalendar& /*calendarGetCalendar*/)
@@ -135,6 +136,8 @@ void WorldSession::HandleCalendarAddEvent(WorldPackets::Calendar::CalendarAddEve
 {
     ObjectGuid guid = _player->GetGUID();
 
+    calendarAddEvent.EventInfo.Time = uint32(LocalTimeToUTCTime(calendarAddEvent.EventInfo.Time));
+
     // prevent events in the past
     // To Do: properly handle timezones and remove the "- time_t(86400L)" hack
     if (calendarAddEvent.EventInfo.Time < (GameTime::GetGameTime() - time_t(86400L)))
@@ -180,6 +183,8 @@ void WorldSession::HandleCalendarUpdateEvent(WorldPackets::Calendar::CalendarUpd
     ObjectGuid guid = _player->GetGUID();
     time_t oldEventTime = time_t(0);
 
+    calendarUpdateEvent.EventInfo.Time = uint32(LocalTimeToUTCTime(calendarUpdateEvent.EventInfo.Time));
+
     // prevent events in the past
     // To Do: properly handle timezones and remove the "- time_t(86400L)" hack
     if (calendarUpdateEvent.EventInfo.Time < (GameTime::GetGameTime() - time_t(86400L)))
@@ -213,6 +218,8 @@ void WorldSession::HandleCalendarCopyEvent(WorldPackets::Calendar::CalendarCopyE
 {
     ObjectGuid guid = _player->GetGUID();
 
+    calendarCopyEvent.Date = uint32(LocalTimeToUTCTime(calendarCopyEvent.Date));
+
     // prevent events in the past
     // To Do: properly handle timezones and remove the "- time_t(86400L)" hack
     if (calendarCopyEvent.Date < (GameTime::GetGameTime() - time_t(86400L)))