feat(eventsub): use special flag and timestamps from metadata (#5996)

src/util/Helpers.hpp

@@ -4,11 +4,14 @@
 #include <QLocale>
 #include <QString>
 
+#include <chrono>
 #include <cmath>
 #include <optional>
 #include <utility>
 #include <vector>
 
+class QDateTime;
+
 namespace chatterino {
 
 // only qualified for tests
@@ -191,4 +194,9 @@ QString unescapeZeroWidthJoiner(QString escaped);
 
 QLocale getSystemLocale();
 
+/// @brief Converts `time` to a QDateTime in a local time zone
+///
+/// Note: When running tests, this will always return a date-time in UTC.
+QDateTime chronoToQDateTime(std::chrono::system_clock::time_point time);
+
 }  // namespace chatterino