Features in KDE Base
KCalendarSystem: Add convenience functions for first/last day of year/month
Add various convenience functions to return the first or last day of the month or year.
It is possible to work these out using the main api, but it's rather long-winded and ugly and easy to get wrong.
Developed in response to a need in Nepomuk, see review on http://svn.reviewboard.kde.org/r/5671/