Hi Stefan,
Thanks for taking the time to look into this ;)
But what procedure do you recommend for applying your executable? Is this meant to substitute for the installation package (such as the downloadable NIS01_INSTALL_2380.exe)? If so, should the original software be uninstalled first? Or is yours to be run as a sort of patch on top of the original product? I did the latter, and see no change in the problem (at 11:28pm on June 7 [NY time], the Forecast screen on my PC shows 10:32pm Nov 8). By the way, that is 213 days going forward in 2012, or 155 days going backward to Nov 2011, inclusive of both dates.
Judging by the string of replies in this thread, there are many owners of the 5-Day Forecast device who would benefit from a step-by-step guide for applying your temporary fix. I, for one, would be quite grateful.