Added utils to core lib

utils/timeutils.cpp

@@ -0,0 +1,23 @@
+#include "timeutils.h"
+
+int timeToSeconds(const QTime &time)
+{
+    return QTime(0, 0).secsTo(time);
+}
+
+QTime timeBetween(const QTime &l, const QTime &r)
+{
+    Q_ASSERT(l <= r);
+    return QTime(0, 0).addSecs(l.secsTo(r));
+}
+
+QTime timeAdd(const QTime &l, const QTime &r)
+{
+    Q_ASSERT(timeToSeconds(l) + timeToSeconds(r) < 86400);
+    return l.addSecs(QTime(0, 0).secsTo(r));
+}
+
+QTime timeNormalise(const QTime &time)
+{
+    return QTime(time.hour(), time.minute());
+}