Lol, I get this. When it happens I just reassert in my own post that it's morning and July, and ignore the other player ignoring it the first time. Just like.... barrel ahead with it and make them look twice if they need to. XD
I would not be able to overlook it, especially in the first posts. I know small confusions usually happen, but if you could not bother to read even my starter carefully, nah. That says a ton about how much effort that person will put into the rest of the rp.
That being said, I have roleplayed with people who made such mistakes every now and then, but were generally amazing writers and good roleplayers despite those little incidents. But I do keep this as a general rule of thumb still, and I haven't been wrong yet.