It's unprofessional to be late to work.
Jane has recently started a new job where she is expected to come in at 9:00.
Jane wants to make an appointment with her doctor who only has appointments available in the morning.
Jane schedules her appointment with the doctor for 8:00 and informs her manager in case it runs late.
Jane schedules the appointment with her doctor at 9:00 without informing anyone at work.
Jane's manager is impressed with Jane's actions and Jane receives a positive review.
Jane is written up and placed on probation at her job.