Most of the solstice and Equinox dates in the calendar are wrong, usually off by one or two. For example, for 2012: Vernal Equinox: Actual Date: March 20th. Listed date: March 22nd Summer Solstice: Actual Date: June 20th. Listed Date: June 22nd Autumnal Equinox: This one is listed correctly as September 22nd Winter Solstice: Actual Date: December 21st. Listed Date: December 22nd They are wrong for other years as well. System is Linux mint 12 with latest KDE 4.7.4 packages from repository.
This is not reproduced, I checked with the same date but the correct date is displayed
All dates were correct for 2015. Please reopen if you can still find discrepancies.