Here are the different ranking cutoffs for the main draw:
- Entry into main draw: ranking as of six weeks prior to the first Monday of the tournament
- Seeds for the main draw: ranking as of one week prior to the first Monday of the tournament
And for the qualifying draw:
- Entry into qualifying draw: ranking as of four weeks prior to the first Monday of the tournament
- Seeds for the qualifying draw: ranking as of the two weeks prior to the first Monday of the tournament (technically most recent ranking as of the qualifying draw coming out, which works out to two weeks before the tournament)
Relevant sections of the Grand Slam rulebook quoted below
Singles Entries and Withdrawals
a. Closing Date
The closing date for entries and withdrawals for the singles Main Draw in each Grand Slam Tournament is forty-two (42) days prior to the first Monday of the tournament except that a player on the Alternate list for the singles Main Draw may withdraw at any time prior to such time as he is moved into the Direct Acceptance on account of withdrawals of other players. The closing date for entries and withdrawals for the Singles Qualifying tournaments is twenty-eight (28) days prior to the first Monday of the tournament
Singles Main Draw
a. Direct Acceptances
Players who are accepted directly in the draw by virtue of their singles ranking. The ranking to be used shall be that dated approximately forty-two (42) days prior to the commencement of the tournament.
f. Seeds
iii. Selection of Seeds The ranking list dated approximately seven (7) days prior to the tournament shall be the basis for such selection.
Singles Qualifying Competition
g. Sections and Seeds
The draw shall be seeded, and the selection of seeds shall be consistent with the most recent available ranking list.