http://ryanseacrest.com/2012/03/05/enter-for-your-chance-to-win-500-worth-of-shell-nitrogen-enriched-gasolines/
Sweepstakes (the “Sweepstakes”) begins at 12:00:01am Pacific Time (“PT”) on March 5, 2012 and ends at 11:59:59pm PT on March 11, 2012 (the “Promotion Period”). All entries must be received during the Promotion Period. The Sponsor’s computer is the official time keeping device for this Sweepstakes.