Setting the date on an Azure instance is futile
You can set the date on an Azure instance, however, it quickly sets it back again. See this console output as an example:
E:\>date 12/10/2004 E:\>date /t Fri 12/10/2004 E:\>date /t Thu 10/13/2011
Even stopping the Windows Time service has no effect.
It looks like Azure always wants to keep up-to-date.