There is an issue when trying to set today to nil in swift as suggested by your documentation. Please see the attached screenshot for further information: <img width="502" alt="screen shot 2016-05-18 at 10 49 07" src="https://cloud.githubusercontent.com/assets/6817230/15352825/67df88f4-1ce6-11e6-9d41-2709c893d413.png">
There is an issue when trying to set today to nil in swift as suggested by your documentation.
Please see the attached screenshot for further information:
