Isn't this story just a hyperventilated case of half-assed journalism not acknowledging that there are several different schools of thought regarding what determines your astrological sign?
AFIAK, the school more popular in the west is based on the seasons and the date ranges don't change.
Also, your sign is relative to your birth, so even as the date ranges change, your astrological sign doesn't (because that is stupid). If you really give a damn, you'll need to look up the ranges for your birth year.