FeatureToggle 1.1.0 includes a new EnabledBetweenDatesFeatureToggle.

 

This toggle can enable a feature when the current date is between a start and end date.

 

Also in 1.1.0 all dates must be specified:  dd/MM/yyyy HH:mm:ss

 

http://nuget.org/packages/FeatureToggle

 

https://github.com/jason-roberts/FeatureToggle/wiki