So Zac if it is that important, take the photo you want to upload just before you post.
And since that sort order applies, remember that those (like Aussies and Kiwis) will appear newer than Americans because we are so far ahead in timezone terms. Because in essence, if I take a photo at say 1 am today it is still yesterday in America. So even if we take a photo at the same "space time" our date times will be different.
Globalisation...
Batman.