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Why would knowing the time in the car help with that?

Knowing the current time in the car also lets you know the current time in general because they are the same piece of information

But I don't need to know the time when I'm going somewhere. I need to know the time before I set off, so I set off at the right time, and then I get there at the right time.

Thats great! How do you know you got there at the right time though?

Because I left at the right time and I know how long the journey takes.

It's quite simple really.

Wow yeah it sounds very simple! How do you know if you left at the right time?

Okay, have you ever visited Earth before? Space and time are both surprisingly linear here.

If I want to be somewhere 250 miles away, I know it takes about six hours to drive there. So, in order to get there in time, I leave maybe six and a half hours before I need to be there. If I know the road is going to be busy - quite often where I live there are a lot of tourists doing 30mph with no idea there's anyone else on the road - I'll give it even more time.

Dead easy.

Sound so easy! You sound like you’ve really solved that whole situation! My question was how do you know if you left at the right time?

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