This Virtual Sundial is keyed to your computer's clock and not to the sun by which a real sundial keeps 'Solar Time'. 

If you are on daylight saving time you will notice that the dial is 1 hour out.

'Solar Time' or 'Local Apparent Time' is usually well out-of-step with the clock which keeps a more convenient averaged 'mean time' or 'standard time'. The latter is simply a man-conceived notion to allow us to harmonise timetables etc. without having to make endless daily/regional corrections and adjustments. 

  There are sundials which read in Standard Time like my Lindi-Mifflin* Meantime Dial.  Lloyd Mifflin patented the shaped profile (an aperture in my dial)  which shifts the shadow by just the right amount throughout the year to convert solar time to clock time as  described in his USA patent No. 64,892 of 21st May 1867. This was my model for a civic presentation item from my local Wanbeck Council to Remscheid in Germany.   It was made in 16mm thick stainless steel cut to shape with a water jet at 60,000 lbs/sq.in.

Why is Sundial Time different from Clock Time?

Amazing time-lapse images showing the irregular motion of the sun when photographed at the same time each day by the clock."