1. When did they arrive at Yosemite?

Question

- They arrived at Yosemite in the afternoon on July 20.

1-2. When did they arrive at Yosemite?
- They arrived at Yosemite in the afternoon on July 20, Friday.

1-3. When did they arrive at Yosemite?
- They arrived at Yosemite in the afternoon, Friday, on July 20.

2. What day did they arrive at Yosemite?
- They arrived at Yosemite on Friday.

3. What date did they arrive at Yosemite?
They arrived at Yosemite on July 20th.

(Are they all grammatical? Would you correct some errors?)

Answer 1

In 1, I'd use "of" instead of "on."

In 1-2, I'd add "a" in front of "Friday."

In 1-3, I'd omit "on."

2 and 3 are fine.