I just noticed this, so I don't know if the dates have always been weird or if it just after the JB update.
When I open the S Planner and view in Day view, the small monthly calendar in the upper right corner is off by one day. For instance, today, the 19th, it shows January 2013 as having this Saturday being the 18th. (See below).
Other views are all correct.
Anyone else experiencing this?

sCalendar by Val W, on Flickr
When I open the S Planner and view in Day view, the small monthly calendar in the upper right corner is off by one day. For instance, today, the 19th, it shows January 2013 as having this Saturday being the 18th. (See below).
Other views are all correct.
Anyone else experiencing this?

sCalendar by Val W, on Flickr