If I recall correctly, United's "quarters" for CR-1's are offset by one month...
In the old days, the January sweep was for Q4 of the previous year.
That is because in order to qualify for CR-1's in January, you'd need to have flown 10,000 BIS by the first Saturday of the month to earn the e500's, then that would trigger the CR-1's during the second-Saturday sweep.
Since the first Saturday is 1/1/11, it would be impossible to get Q1 2011 CR-1's under the way the system had been set up...