If one navigates away from today's date (by more than the current month), there is no way to easily return, other than to close and re-open the calendar widget. 4.x had a 'Today' button, it would be really useful if this was re-instated :)
Confirming this feature is missing in current plasma git.
Added ReviewRequest for readding the button: https://git.reviewboard.kde.org/r/124397/
Git commit 4ebf130ee66a912a5dac360441a8c0060eab247e by Kai Uwe Broulik.
Committed on 07/02/2016 at 23:07.
Pushed by broulik into branch 'master'.
[Calendar] Add proper back/forward buttons and a "Today" button
This removes the custom label-based triangles and replaces them with proper ToolButtons
using proper icons. It also adds a "Today" button to return to the current day.
The tooltips on the buttons reflect the actual action ("Previous Month", "Previous Year",
"Previous Decade", depending on the zoom level).
Furthermore, the day names and week numbers now use the regular font size but they're still
visually disconnected. The day names row is hidden in the zoom levels now.
Related: bug 336124, bug 358536
M +5 -1 src/declarativeimports/calendar/qml/DayDelegate.qml
M +69 -80 src/declarativeimports/calendar/qml/DaysCalendar.qml
M +10 -1 src/declarativeimports/calendar/qml/MonthView.qml