diff --git a/client/helper.cpp b/client/helper.cpp
index e5e390c..aee6481 100644
--- a/client/helper.cpp
+++ b/client/helper.cpp
@@ -79,6 +79,12 @@ date date::fromTimestamp(time_t timestamp, int options)
     return r;
 }
 
+date date::today()
+{
+    date r = date::fromTimestamp(time(nullptr), To_LocalTime);
+    return r;
+}
+
 int date::daysInMonth(int y, int m)
 {
     switch (m)
@@ -103,6 +109,26 @@ int date::daysInMonth(int y, int m)
     }
 }
 
+bool date::operator < (const date& rhs)
+{
+    return std::tie(mYear, mMonth, mDay) < std::tie(rhs.mYear, rhs.mMonth, rhs.mDay);
+}
+
+bool date::operator > (const date& rhs)
+{
+    return std::tie(mYear, mMonth, mDay) > std::tie(rhs.mYear, rhs.mMonth, rhs.mDay);
+}
+
+bool date::operator == (const date& rhs)
+{
+    return std::tie(mYear, mMonth, mDay) == std::tie(rhs.mYear, rhs.mMonth, rhs.mDay);
+}
+
+bool date::operator >= (const date& rhs)
+{
+    return std::tie(mYear, mMonth, mDay) >= std::tie(rhs.mYear, rhs.mMonth, rhs.mDay);
+}
+
 
 std::string chrono::secondsToDisplay(int seconds, bool showSeconds)
 {
@@ -125,6 +151,7 @@ std::string chrono::timeToStr(time_t timestamp)
     return buf;
 }
 
+/*
 std::string chrono::timeToLocalStr(time_t timestamp)
 {
     char buf[128];
@@ -132,6 +159,7 @@ std::string chrono::timeToLocalStr(time_t timestamp)
     strftime(buf, sizeof buf, "%FT%TZ", &t);
     return buf;
 }
+*/
 
 time_t chrono::strToTime(const std::string& s)
 {
diff --git a/client/helper.h b/client/helper.h
index e009fbd..fdca824 100644
--- a/client/helper.h
+++ b/client/helper.h
@@ -33,19 +33,19 @@ namespace helper
         static date today();
         static date fromTm(struct tm& t);
         static int daysInMonth(int y, int m);
+
+        bool operator < (const date& rhs);
+        bool operator > (const date& rhs);
+        bool operator == (const date& rhs);
+        bool operator >= (const date& rhs);
     };
 
-    bool operator < (const date& lhs, const date& rhs);
-    bool operator > (const date& lhs, const date& rhs);
-    bool operator == (const date& lhs, const date& rhs);
-    bool operator >= (const date& lhs, const date& rhs);
 
     class chrono
     {
     public:
         static std::string secondsToDisplay(int seconds, bool showSeconds);
         static std::string timeToStr(time_t timestamp);
-        static std::string timeToLocalStr(time_t timestamp);
         static time_t strToTime(const std::string& s);
         static struct tm localtime(time_t timestamp);
         static int daysInMonth(int m, int y);
diff --git a/client/mainwindow.cpp b/client/mainwindow.cpp
index 77a207c..7e085bc 100644
--- a/client/mainwindow.cpp
+++ b/client/mainwindow.cpp
@@ -892,7 +892,7 @@ void MainWindow::startTrackingRecent()
     }
 }
 
-void MainWindow::stopTracking(TrackingStopReason reason, const QDateTime& currentUtc)
+void MainWindow::stopTracking(TrackingStopReason reason, time_t current_utc)
 {
     // Check if false call
     if (!mCurrentTask)
@@ -907,7 +907,7 @@ void MainWindow::stopTracking(TrackingStopReason reason, const QDateTime& curren
 
 
     // Tell current task to stop
-    mCurrentTask->timeline()->flush(true /* save to DB */, currentUtc);
+    mCurrentTask->timeline()->flush(true /* save to DB */, current_utc);
     mCurrentTask->timeline()->stop(false /* do not update timeline - it is done in the previous line */);
 
     // Save stopped task name
@@ -1301,7 +1301,7 @@ void MainWindow::updateTrayIcon(TrayShowMessage flag)
     {
         bool showSeconds = mSettings->data()[KEY_SHOW_SECONDS].toBool();
         int spentSecondsToday = mCurrentTask->timeline()->today();
-        QString timeString = helper::chrono::secondsToDisplay(spentSecondsToday, showSeconds);
+        QString timeString = QString::fromStdString(helper::chrono::secondsToDisplay(spentSecondsToday, showSeconds));
         tooltip = tr("Litt is tracking ") + mCurrentTask->title() + ".\n" +
                 tr("Time spent today for this task is ") + timeString;
     }
@@ -1445,7 +1445,7 @@ void MainWindow::checkForUpdates()
 void MainWindow::systemSleep()
 {
     //qDebug() << "System goes to sleep";
-    stopTracking(TSR_Automatic, QDateTime::currentDateTimeUtc());
+    stopTracking(TSR_Automatic, QDateTime::currentDateTimeUtc().toTime_t());
 }
 
 void MainWindow::systemResume()
@@ -1472,7 +1472,7 @@ void MainWindow::changeTimeTrackableFlag(bool trackable)
 
     // Stop task if it is marked as non tracking and it is running now
     if (!trackable && mCurrentTask == t)
-        stopTracking(TSR_Manual, QDateTime::currentDateTimeUtc());
+        stopTracking(TSR_Manual, time(nullptr));
 
     // Update UI
     handleTrackableState(t);
@@ -1517,11 +1517,11 @@ void MainWindow::findRequested()
     }
 
     //ui->mFindEdit->setVisible(false);
-    QTextCursor c = ui->mNoteEdit->document()->find(pattern, mFindStartIndex, 0);
+    QTextCursor c = ui->mNoteEdit->document()->find(pattern, mFindStartIndex, nullptr);
     if (c.isNull())
     {
         mFindStartIndex = 0;
-        c = ui->mNoteEdit->document()->find(pattern, mFindStartIndex, 0);
+        c = ui->mNoteEdit->document()->find(pattern, mFindStartIndex, nullptr);
     }
     if (!c.isNull())
     {
@@ -1595,7 +1595,7 @@ void MainWindow::continueOnIdle()
 void MainWindow::breakOnIdle(const QDateTime& stopTime)
 {
     // Stop tracking
-    stopTracking(TSR_Manual, stopTime);
+    stopTracking(TSR_Manual, stopTime.toUTC().toTime_t());
     showTimeForSelectedTask();
 }
 
diff --git a/client/mainwindow.h b/client/mainwindow.h
index 475ce38..952c27a 100644
--- a/client/mainwindow.h
+++ b/client/mainwindow.h
@@ -160,7 +160,7 @@ public slots:
   void startTracking();
   void startTrackingRecent();
 
-  void stopTracking(TrackingStopReason reason, const QDateTime& currentUtc = QDateTime::currentDateTimeUtc());
+  void stopTracking(TrackingStopReason reason, time_t current_utc = time(nullptr));
   void updateData();
   void add10Mins();
 
diff --git a/client/task.cpp b/client/task.cpp
index 16660eb..5728501 100644
--- a/client/task.cpp
+++ b/client/task.cpp
@@ -726,62 +726,72 @@ int TimeLine::month()
     int result = 0;
 
     // Find first day of month
-    QDate currentMonth = QDate::currentDate();
-    currentMonth.setDate(currentMonth.year(), currentMonth.month(), 1);
+    date this_month = date::today();
+    this_month.mDay = 1;
 
     // Find position in time record array close to month begin
-    TimeArray::iterator lowIter = std::lower_bound(mData.begin(), mData.end(), currentMonth, [] (const TimeRecord& lhs, const QDate& rhs) { return lhs.endTime().toLocalTime().date() < rhs; });
+    TimeArray::iterator lowIter = std::lower_bound(mData.begin(), mData.end(), this_month,
+                                                   [] (const TimeRecord& lhs, const date& rhs)
+    {
+        return date::fromTimestamp(lhs.endTime(), date::To_LocalTime) < rhs;
+    });
 
-    for (;lowIter != mData.end(); lowIter++)
+    while (lowIter != mData.end())
     {
         // See if start of current time period is later than current month
-        if (lowIter->startTime().toLocalTime().date().month() > currentMonth.month())
+        if (date::fromTimestamp(lowIter->startTime(), date::To_LocalTime).mMonth > this_month.mMonth)
             break; // quit the loop
 
-        if (lowIter->endTime().toLocalTime().date().month() >= currentMonth.month())
+        if (date::fromTimestamp(lowIter->endTime(), date::To_LocalTime).mMonth >= this_month.mMonth)
         {
-            QDateTime monthBegin(currentMonth, QTime(0,0));
-            QDateTime monthEnd(QDate(currentMonth.year(), currentMonth.month(), currentMonth.daysInMonth()), QTime(23, 59, 59));
+            // GMT time!
+            time_t month_begin = this_month.toTimestamp();
+            time_t month_end = month_begin + date::daysInMonth(this_month.mYear, this_month.mMonth) * 86400 - 1;
 
-            int secondsTo = monthBegin.secsTo(lowIter->startTime().toLocalTime());
+            int64_t secondsTo = lowIter->startTime() - month_begin;
             if (secondsTo > 0)
-                monthBegin = lowIter->startTime();
+                month_begin = lowIter->startTime();
 
-            int secondsFrom = monthEnd.secsTo(lowIter->endTime().toLocalTime());
+            int64_t secondsFrom = lowIter->endTime() - month_end;
             if (secondsFrom < 0)
-                monthEnd = lowIter->endTime().toLocalTime();
+                month_end = lowIter->endTime();
 
-            int secondsSpent = monthBegin.secsTo(monthEnd);
+            int64_t secondsSpent = month_end - month_begin;
             result += secondsSpent;
         }
+
+        lowIter++;
     }
 
     return result;
 }
 
-int TimeLine::getSum(const QDate& start, const QDate& finish)
+int TimeLine::getSum(const date& start, const date& finish)
 {
     int result = 0;
 
-    TimeArray::iterator lowest = std::lower_bound(mData.begin(), mData.end(), start, [] (const TimeRecord& tr, const QDate& d) { return tr.endTime().toLocalTime().date() < d;});
-    //TimeArray::iterator higher = std::upper_bound(mData.begin(), mData.end(), finish, [] (const QDate& d, const TimeRecord& tr) { return tr.startTime().toLocalTime().date() < d;});
+    TimeArray::iterator lowest = std::lower_bound(mData.begin(), mData.end(), start,
+                                                  [] (const TimeRecord& tr, const date& d)
+    {
+        return date::fromTimestamp(tr.endTime(), date::To_LocalTime) < d;
+    });
 
     for (;lowest != mData.end(); lowest++)
     {
         TimeRecord& tr = *lowest;
-        if (tr.startTime().toLocalTime().date() > finish)
+        if (date::fromTimestamp(tr.startTime(), date::To_LocalTime) > finish)
             break;
 
-        QDateTime dayBegin(start, QTime(0, 0, 0));
-        QDateTime dayEnd(finish, QTime(23, 59, 59));
+        time_t day_begin = start.toTimestamp();
+        time_t day_end = finish.toTimestamp() + 86400 - 1;
 
-        if (tr.startTime().toLocalTime().secsTo(dayBegin) < 0)
-            dayBegin = tr.startTime().toLocalTime(); // Time record begin is later than begin of the interval
+        if (day_begin - tr.startTime() < 0)
+            day_begin = tr.startTime(); // Time record begin is later than begin of the interval
 
-        if (tr.endTime().toLocalTime().secsTo(dayEnd) > 0)
-            dayEnd = tr.endTime().toLocalTime();
+        if (day_end - tr.endTime() > 0)
+            day_end = tr.endTime();
 
-        result += dayBegin.secsTo(dayEnd);
+        result += day_end - day_begin;
     }
     return result;
 }
@@ -793,8 +803,9 @@ bool TimeLine::duplicateDetected() const
 
 void TimeLine::putDebugRecord()
 {
-    QDateTime current = QDateTime::currentDateTimeUtc();
-    QDateTime end = current.addSecs(600);
+    time_t current = time(nullptr);
+    time_t end = current + 600;
+
     TimeRecord* r = makeNewRecord(current, end);
     r->save();
 }
diff --git a/client/task.h b/client/task.h
index 01ea9d3..c8956ed 100644
--- a/client/task.h
+++ b/client/task.h
@@ -11,6 +11,7 @@
 #include <memory>
 #include <map>
 #include "SQLiteCpp/Database.h"
+#include "helper.h"
 
 typedef int64_t Id;
 
@@ -70,6 +71,7 @@ typedef std::map<int, QSharedPointer<HoursSet> > DaysMap;
 typedef std::map<int, QSharedPointer<DaysMap> > MonthesMap;
 typedef std::map<int, QSharedPointer<MonthesMap> > YearsMap;
 
+
 class TimeLine
 {
 public:
@@ -110,7 +112,7 @@ public:
     int month();
 
     // Returns number of seconds spent in interval
-    int getSum(const QDate& start, const QDate& finish);
+    int getSum(const helper::date& start, const helper::date& finish);
 
     // Checks if there duplicate & overllaping time intervals
     bool duplicateDetected() const;
diff --git a/client/timeintervaldlg.cpp b/client/timeintervaldlg.cpp
index 7b1d916..7c01341 100644
--- a/client/timeintervaldlg.cpp
+++ b/client/timeintervaldlg.cpp
@@ -47,7 +47,7 @@ QDateTime TimeIntervalDlg::finishDate()
 void TimeIntervalDlg::accept()
 {
   // Insert interval
-  mModel->insertInterval(TimeRecord(startDate().toUTC(), finishDate().toUTC(), mTimeline->taskId()));
+  mModel->insertInterval(TimeRecord(startDate().toUTC().toTime_t(), finishDate().toUTC().toTime_t(), mTimeline->taskId()));
   emit accepted();
   close();
 }
@@ -68,7 +68,7 @@ void TimeIntervalDlg::closeEvent(QCloseEvent *event)
 bool TimeIntervalDlg::validate()
 {
   assert(mTimeline);
-  return !mTimeline->hasIntersection(TimeRecord(startDate().toUTC(), finishDate().toUTC(), mTimeline->taskId()));
+  return !mTimeline->hasIntersection(TimeRecord(startDate().toUTC().toTime_t(), finishDate().toUTC().toTime_t(), mTimeline->taskId()));
 }
 
 void TimeIntervalDlg::dataChanged(const QDateTime& changed)
diff --git a/client/timereportwizard.cpp b/client/timereportwizard.cpp
index e5772e1..385064f 100644
--- a/client/timereportwizard.cpp
+++ b/client/timereportwizard.cpp
@@ -5,6 +5,8 @@
 #include "helper.h"
 #include "settings.h"
 
+using namespace helper;
+
 TaskTreePage::TaskTreePage(QWidget *parent)
   :QWizardPage(parent), mTaskView(nullptr), mTaskModel(nullptr)
 {
@@ -120,7 +122,9 @@ void ReportViewPage::generateReport()
       t->loadContent();
     }
 
-    int seconds = t->timeline()->getSum(startDate, finishDate);
+    date start_date(startDate.year(), startDate.month(), startDate.day());
+    date finish_date(finishDate.year(), finishDate.month(), finishDate.day());
+    int seconds = t->timeline()->getSum(start_date, finish_date);
     t->setReportedTime(seconds);
     t->setChildrenReportedTime(0);
     if (wasLoaded)
@@ -140,14 +144,14 @@ void ReportViewPage::generateReport()
   {
     int individualTime = t->getReportedTime();
     bool showSeconds = mSettings.data()[KEY_SHOW_SECONDS].toBool();
-    QString l1 = helper::chrono::secondsToDisplay(individualTime, showSeconds);
+    QString l1 = QString::fromStdString(chrono::secondsToDisplay(individualTime, showSeconds));
     report += t->path() + " : " + l1;
     //if (mSettings.data()[KEY_CUMULATIVE_REPORT].toBool())
     {
       int childrenTime = t->getChildrenReportedTime();
       if (childrenTime)
       {
-        QString l2 = helper::chrono::secondsToDisplay(individualTime + childrenTime, showSeconds);
+        QString l2 = QString::fromStdString(chrono::secondsToDisplay(individualTime + childrenTime, showSeconds));
         report += ". Including subtasks time: " + l2;
       }
     }
diff --git a/client/timetreemodel.cpp b/client/timetreemodel.cpp
index 9c0e7bc..cc2377b 100644
--- a/client/timetreemodel.cpp
+++ b/client/timetreemodel.cpp
@@ -1,8 +1,11 @@
 #include "timetreemodel.h"
 #include "helper.h"
+
 #include <QFontMetrics>
 #include <assert.h>
 
+using namespace helper;
+
 #ifdef USE_SIMPLE_TIMETREE
 
 TimeTreeModel::TimeTreeModel(PTimeLine timeline)
@@ -138,7 +141,7 @@ QModelIndex TimeTreeModel::index(int row, int column, const QModelIndex &parent)
     switch (l)
     {
     case Level_Year:
-        mTimeLine->getYears(components);
+        components = mTimeLine->getYears();
         iter = components.begin();
         std::advance(iter, row);
         id = PackDate(Level_Year, *iter, 1, 1, 0);
@@ -146,7 +149,7 @@ QModelIndex TimeTreeModel::index(int row, int column, const QModelIndex &parent)
 
     case Level_Month:
         // Find monthes set
-        mTimeLine->getMonthes(year, components);
+        components = mTimeLine->getMonthes(year);
         iter = components.begin();
         std::advance(iter, row);
         month = *iter;
@@ -157,7 +160,7 @@ QModelIndex TimeTreeModel::index(int row, int column, const QModelIndex &parent)
 
     case Level_Day:
         // Get set of available days
-        mTimeLine->getDays(year, month, components);
+        components = mTimeLine->getDays(year, month);
 
         // Find day corresponding by requested row
         iter = components.begin();
@@ -198,19 +201,19 @@ QModelIndex TimeTreeModel::parent(const QModelIndex &child) const
         return QModelIndex();
 
     case Level_Month:
-        mTimeLine->getYears(components);
+        components = mTimeLine->getYears();
         iter = components.find(year);
         row = std::distance(components.begin(), iter);
         return createIndex(row, 0, PackDate(Level_Year, year, 1, 1, 0));
 
     case Level_Day:
-        mTimeLine->getMonthes(year, components);
+        components = mTimeLine->getMonthes(year);
         iter = components.find(month);
         row = std::distance(components.begin(), iter);
         return createIndex(row, 0, PackDate(Level_Month, year, month, 1, 0));
 
     case Level_Time:
-        mTimeLine->getDays(year, month, components);
+        components = mTimeLine->getDays(year, month);
         iter = components.find(day);
         row = std::distance(components.begin(), iter);
         return createIndex(row, 0, PackDate(Level_Day, year, month, day, 0));
@@ -238,13 +241,13 @@ int TimeTreeModel::rowCount(const QModelIndex &parent) const
     {
     case Level_Month:
         // Find how much monthes are in that year related records
-        mTimeLine->getMonthes(year, rows);
+        rows = mTimeLine->getMonthes(year);
         result = rows.size();
         break;
 
     case Level_Day:
         // Find how much days are in that year&month related records
-        mTimeLine->getDays(year, month, rows);
+        rows = mTimeLine->getDays(year, month);
         result = rows.size();
         break;
 
@@ -254,7 +257,7 @@ int TimeTreeModel::rowCount(const QModelIndex &parent) const
         break;
 
     case Level_Year:
-        mTimeLine->getYears(rows);
+        rows = mTimeLine->getYears();
         result = rows.size();
         break;
 
@@ -305,7 +308,9 @@ QVariant TimeTreeModel::data(const QModelIndex &index, int role) const
         tr = intervals[index.row()];
 
         // Intervals are in local time already
-        return QString("%1 - %2").arg(helper::chronotr.startTime().time().toString(mTimeFormat), tr.endTime().time().toString(mTimeFormat));
+        // ToDo: they are in GMT!
+        return QString("%1 - %2").arg(QString::fromStdString(chrono::secondsToDisplay(tr.startTime(), false)),
+                                      QString::fromStdString(chrono::secondsToDisplay(tr.endTime(), false)));
 
     default:
         return QVariant();
@@ -479,7 +484,7 @@ QModelIndex TimeTreeModel::dayToIndex(const QDate& date)
 {
     std::set<int> components;
     std::set<int>::iterator iter;
-    mTimeLine->getYears(components);
+    components = mTimeLine->getYears();
 
     iter = components.find(date.year());
     if (iter == components.end())
@@ -487,14 +492,14 @@ QModelIndex TimeTreeModel::dayToIndex(const QDate& date)
     int yearRow = std::distance(components.begin(), iter);
     QModelIndex yearIndex = this->createIndex(yearRow, 0, PackDate(Level_Year, date.year(), 1, 1, 0));
 
-    mTimeLine->getMonthes(date.year(), components);
+    components = mTimeLine->getMonthes(date.year());
     iter = components.find(date.month());
     if (iter == components.end())
         return QModelIndex();
     int monthRow = std::distance(components.begin(), iter);
     QModelIndex monthIndex = this->createIndex(monthRow, 0, PackDate(Level_Month, date.year(), date.month(), 1, 0));
 
-    mTimeLine->getDays(date.year(), date.month(), components);
+    components = mTimeLine->getDays(date.year(), date.month());
     iter = components.find(date.day());
     if (iter == components.end())
         return QModelIndex();