Before each Day (including Day 1), you may send the moderator a number, and the following Day/Night cycle will be given that number. This cannot be blocked, although if you don't it will default to the number after the previous Day (even if it has already been used), or 1 if it is the first Day. It must be an integer, and it cannot be negative (though it can be 0). You cannot choose the number of a Day that has already taken place.
If a second Timelord is rolled in a setup, reroll it (so each setup can only have one).