Use secsTo instead of secsTo_long, the later is deprecated

src/datetime.cpp

@@ -321,7 +321,7 @@ int DateTime::secsTo(const DateTime &dt) const
 
 qint64 DateTime::secsTo_long(const DateTime &dt) const
 {
-    return d->mDateTime.secsTo_long(dt.d->mDateTime);
+    return d->mDateTime.secsTo(dt.d->mDateTime);
 }
 
 QString DateTime::toString(Qt::DateFormat f) const

src/repetition.cpp

@@ -147,14 +147,14 @@ int Repetition::nextRepeatCount(const KDateTime &from, const KDateTime &preDateT
 {
     return d->mInterval.isDaily()
            ? from.daysTo(preDateTime) / d->mInterval.asDays() + 1
-           : static_cast<int>(from.secsTo_long(preDateTime) / d->mInterval.asSeconds()) + 1;
+           : static_cast<int>(from.secsTo(preDateTime) / d->mInterval.asSeconds()) + 1;
 }
 
 int Repetition::previousRepeatCount(const KDateTime &from, const KDateTime &afterDateTime) const
 {
     return d->mInterval.isDaily()
            ? from.daysTo(afterDateTime.addSecs(-1)) / d->mInterval.asDays()
-           : static_cast<int>((from.secsTo_long(afterDateTime) - 1) / d->mInterval.asSeconds());
+           : static_cast<int>((from.secsTo(afterDateTime) - 1) / d->mInterval.asSeconds());
 }
 
 } // namespace KAlarmCal