QDateTime::toString is really slow

2 files changed, 14 insertions, 7 deletions

diff --git a/common/propertymapper.cpp b/common/propertymapper.cpp
index c72cf31..c14a62e 100644
--- a/common/propertymapper.cpp
+++ b/common/propertymapper.cpp
@@ -21,6 +21,7 @@
 
 #include "applicationdomaintype.h"
 #include <QDateTime>
+#include <QDataStream>
 #include "mail_generated.h"
 #include "contact_generated.h"
 
@@ -66,7 +67,10 @@ template <>
 flatbuffers::uoffset_t variantToProperty<QDateTime>(const QVariant &property, flatbuffers::FlatBufferBuilder &fbb)
 {
     if (property.isValid()) {
-        return fbb.CreateString(property.toDateTime().toString().toStdString()).o;
+        QByteArray ba;
+        QDataStream ds(&ba, QIODevice::WriteOnly);
+        ds << property.toDateTime();
+        return fbb.CreateString(ba.toStdString()).o;
     }
     return 0;
 }
@@ -256,8 +260,11 @@ template <>
 QVariant propertyToVariant<QDateTime>(const flatbuffers::String *property)
 {
     if (property) {
-        // We have to copy the memory, otherwise it would become eventually invalid
-        return QDateTime::fromString(QString::fromStdString(property->c_str()));
+        auto ba = QByteArray::fromRawData(property->c_str(), property->size());
+        QDateTime dt;
+        QDataStream ds(&ba, QIODevice::ReadOnly);
+        ds >> dt;
+        return dt;
     }
     return QVariant();
 }
diff --git a/common/typeindex.cpp b/common/typeindex.cpp
index b8845b7..113c209 100644
--- a/common/typeindex.cpp
+++ b/common/typeindex.cpp
@@ -21,16 +21,16 @@
 #include "log.h"
 #include "index.h"
 #include <QDateTime>
+#include <QDataStream>
 
 using namespace Sink;
 
 static QByteArray getByteArray(const QVariant &value)
 {
     if (value.type() == QVariant::DateTime) {
-        const auto result = value.toDateTime().toString().toLatin1();
-        if (result.isEmpty()) {
-            return "nodate";
-        }
+        QByteArray result;
+        QDataStream ds(&result, QIODevice::WriteOnly);
+        ds << value.toDateTime();
         return result;
     }
     if (value.type() == QVariant::Bool) {