#1962 : Observed Data : Add helper class for QDateTime and use from parsers

ApplicationCode/Application/Tools/RiaQDateTimeTools.cpp

@@ -0,0 +1,111 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2017     Statoil ASA
+// 
+//  ResInsight 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 3 of the License, or
+//  (at your option) any later version.
+// 
+//  ResInsight 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 at <http://www.gnu.org/licenses/gpl.html> 
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+#include "RiaQDateTimeTools.h"
+
+#include <QString>
+#include <QDateTime>
+
+#include <ctime>
+#include <cmath>
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+quint64 RiaQDateTimeTools::secondsInDay()
+{
+    return 60 * 60 * 24;
+}
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+quint64 RiaQDateTimeTools::secondsInYear()
+{
+    return 60 * 60 * 24 * 365;
+}
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+QDateTime RiaQDateTimeTools::fromString(const QString& dateString, const QString& format)
+{
+    QDateTime dt = QDateTime::fromString(dateString, format);
+    dt.setTimeSpec(Qt::UTC);
+
+    return dt;
+}
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+QDateTime RiaQDateTimeTools::fromYears(double years)
+{
+    double yearsAfterEpoch = years - 1970.0;
+
+    QDateTime dt = RiaQDateTimeTools::epoch();
+
+    return RiaQDateTimeTools::addYears(dt, yearsAfterEpoch);
+}
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+QDateTime RiaQDateTimeTools::addDays(const QDateTime& dt, double days)
+{
+    double integerPart = 0.0;
+    double fractionPart = 0.0;
+
+    fractionPart = modf(days, &integerPart);
+
+    QDateTime tmp = dt.addDays(integerPart);
+    tmp = tmp.addSecs(fractionPart * RiaQDateTimeTools::secondsInDay());
+
+    return tmp;
+}
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+QDateTime RiaQDateTimeTools::addYears(const QDateTime& dt, double years)
+{
+    double integerPart = 0.0;
+    double fractionPart = 0.0;
+
+    fractionPart = modf(years, &integerPart);
+
+    QDateTime tmp = dt.addYears(integerPart);
+    tmp = tmp.addSecs(fractionPart * RiaQDateTimeTools::secondsInYear());
+
+    return tmp;
+}
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+QDateTime RiaQDateTimeTools::epoch()
+{
+
+    // NB: Not able to use QDateTime::fromMSecsSinceEpoch as this was introduced in Qt 4.7
+
+    QDateTime dt;
+    dt.setDate(QDate(1970, 1, 1)); 
+    dt.setTimeSpec(Qt::UTC);
+
+    return dt;
+}