https://www.hiltonhhonors.com/Proces...?lp=ddesoterms
Double Dip® Earnings Style Terms and Conditions
1. Effective July 1, 2004, Hilton HHonors Members may select an Earnings Style from three options:
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5. Members can change their Earnings Style at any time.
6. The Earnings Style Option in place for a Member as of 23:59:59 U.S. Central Standard Time on the day of check-out for a given stay will be the Option that governs earnings for that stay. No changes can be made retroactively for past stays.