As a provider of services for the New York City Department of Education, would one be able to service children on a date that is legally not billable, and bill it for a different date that I was absent? For example, may I service children on a Sunday, which is in a school setting, so it is the same setup as other days, albeit not legal, and bill that Sunday session for a day that I missed because of illness?
The rules of the Department of Education should be followed. Being that these are the rules of the employer and the terms of your contract one must adhere to them and not mislead the employer. Perhaps special permission can be gained for Sunday billing. If not only billable days should be counted.