It depends: If a product is being released at 11AM Eastern Standard Time, then in Denver, Colorado, which is in Mountain Standard Time, it will be released at 9AM. However, if it's being released in 11AM Pacific Standard Time, then in Denver it will be released at 12PM. The same applies to other time zones, for which you have to convert the time, such as 11AM Central Standard Time, which is 10AM in Colorado ...
Hope this helps.
Cheers,
JTM