that is correct, but it must be 180 days out from each day you wish to dine. so if today is 180 days from the 1st day of your trip, you can make adrs for that day, but have to call tomorrow at 180 days for Day 2 of your trip, etc
onsite guests can make ADRs for 180 days + 10, so essentially the whole trip from 180 days out from the arrival day