I would like to know which phrasal verb is the correct one to be used when talking about *an appointment*.

I have heard some say **remind about** is the correct one because it talks about something in the future that I have to do. And I have heard others say **remind of** is the correct one because it's the one to be used for something already set such as an appointment.

So, what do you think? Which one should I use in this case?

Here are a few example sentences:

> 
> 1. The alarm **reminded** Tim **of** his appointment.
> 2. The alarm **reminded** Tim **about** his appointment.
> 3. Thank you for **reminding** me **of** my doctor's appointment tomorrow—I had completely forgotten!
> 4. Thank you for **reminding** me **about** my doctor's appointment tomorrow—I had completely forgotten!
> 
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