Core/Calendar: Implement different timezone support for ingame calendar

Closes #8390
Closes #29427

1 files changed, 37 insertions, 0 deletions

diff --git a/src/common/Time/Timezone.h b/src/common/Time/Timezone.h
new file mode 100644
index 00000000000..769bf0c5921
--- /dev/null
+++ b/src/common/Time/Timezone.h
@@ -0,0 +1,37 @@
+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TRINITYCORE_TIMEZONE_H
+#define TRINITYCORE_TIMEZONE_H
+
+#include "Define.h"
+#include "Duration.h"
+
+namespace Trinity::Timezone
+{
+TC_COMMON_API Minutes GetOffsetByHash(uint32 hash);
+
+// Returns the time offset that must be added to UTC time to get localtime
+TC_COMMON_API Minutes GetSystemZoneOffsetAt(SystemTimePoint date);
+TC_COMMON_API Minutes GetSystemZoneOffset(bool applyDst = true);
+
+TC_COMMON_API std::string GetSystemZoneName();
+
+TC_COMMON_API std::string_view FindClosestClientSupportedTimezone(std::string_view currentTimezone, Minutes currentTimezoneOffset);
+}
+
+#endif // TRINITYCORE_TIMEZONE_H