I am on sick leave and my employer is stating I must go on mat leave on the predicted date of birth by my OB? They state this is in the standards employment act. I can’t find such information.

Thank you for your question. You leave can start on the actual day the baby is born. It does not have to be the due date. See here:

https://www.ontario.ca/document/your-guide-employment-standards-act/pregnancy-and-parental-leave#section-1