Fix the selected date not receiving the "active" CSS style

The original code was comparing 5th April 2013 0:00 **GMT+1** to 5th April
2013 0:00 **GMT+0**, which are not equal and so the "active" style was never
being applied.

Maybe this is a daylight savings time issue - we recently moved from
GMT-0 to GMT+1, perhaps that's why this issue wasn't showing up before?

I'm sorry, but I have no clue how to write a test for this.