What is Day 1, Day 2, etc. in a Global Directs schedule file?

This is field shows whether a flight is scheduled on a particular day of the week. Day 1 is always Monday in aviation schedule data. Global direct schedule files are always in local time.

Day 1 - Indicates whether the flight has service on Monday.
Day 2 - Indicates whether the flight has service on Tuesday.
Day 3 - Indicates whether the flight has service on Wednesday.
Day 4 - Indicates whether the flight has service on Thursday.
Day 5 - Indicates whether the flight has service on Friday.
Day 6 - Indicates whether the flight has service on Saturday.
Day 7 - Indicates whether the flight has service on Sunday.