When people who are consistently punctual are late once a decade, they say, “It was my fault. I apologize. I understand you have to dock my pay.”
Tardiness demonstrates that you are self-centered. If you are informed of an appointment you can think, "I'm supposed to meet him there at such and such a time," or "He's supposed to meet me there at such and such a time."
If you think that you're to meet him, you'll be on time. If you think that he's to meet you, you'll probably be late.