Genesis specifies literal days, the morning and evening of the first day, second day, etc. Written at a time when people had no idea of the sheer scope and scale of the universe.
Days passed
between his commands to nature. There's no reason to assume that days passed between nature obeying his commands.
There's nothing false, for example, about the statement: "On Monday, March 3rd, 1943, General Richards commanded the fort be constructed, and it was so, and he saw that it was good," even if construction wasn't complete for a month. Heck, it's the case even if construction didn't
start for a month, it's still a perfectly true statement from our perspective in the year 2023. There's nothing in the statement that grammatically requires that the fort was
completed on March 3rd.
The above statement could go on and read that the next day, "On March 4th, 1943, General Richards commanded that his third brigade take Strasbourg, and it was so, and he saw that it was good." Again, the statement isn't an assertion that on March 4th the city was actually taken. It could have been days or weeks later, but from our perspective in 2023, it's a perfectly correct statement, and doesn't even force the conclusion that it occurred after the fort was constructed.
All we know from the above two statements (from our perspective in 2023) are the dates on which the two commands were issued, and the sequence of the two commands. Information about when they were accomplished isn't contained in them, just that at some point they were.
