This module adds the ability for pages defined with page manager to define date contexts to, for example, take dates as arguments. Any date that can be interpreted by strtotime is a valid date argument.
The date argument then turns into a page manager context which you can send to a view for example. You can also modify the date argument for every context using strtotime syntax.
For example if the date argument is 2011-01-01 and you modify with the string '+1 week' the date value of that context becomes 2011-01-08.