I'm not aware of any government (FAA) mandate that monthly schedules be published at/by a certain time. If the pilots are represented by a union, they may have a voice via some contractual obligation in that regard.
An example of an ALPA contract at a US legacy carrier contains this language:
"A pilot’s adjusted line for the following bid period will be available to the pilot via DBMS at or before 1800E on the 17th of the month."
I'm told the "line" (their word for roster) is often available ahead of that contract-required date.
But the Imperial Federal Kakistocracy didn't have their slimy hands on that.
Last edited by bafanguy; 26th Feb 2023 at 22:38.