calendar.txt: Dates for service IDs using a weekly schedule. Specify when service starts and ends, as well as days of the week where service is available.
| Column |
|---|
| start_date |
| end_date |
| monday |
| tuesday |
| wednesday |
| thursday |
| friday |
| saturday |
| sunday |
| service_id |
start_date,end_date,monday,tuesday,wednesday,thursday,friday,saturday,sunday,service_id 20181101,20181108,1,1,1,1,1,1,1,1