I would like to ask about the definition of LAST_N_DAYS:n
For the number n provided, starts 00:00:00 of the current day and continues for the past n days.
CreatedDate = LAST_N_DAYS:1
(CreatedDate >= 2017-08-30T00:00:00Z AND CreatedDate <= 2017-08-30T23:59:59Z) OR CreatedDate = TODAY
CreatedDate >= YESTERDAY
To be more specific, isn't LAST_N_DAYS in fact LAST_N_DAYS + 1 (Today)?