Not so with my second blog, which is a photography blog. I posted two photos today and the oldest one is at the top. I have been unable to find if there’s anywhere that tells the blog to sort in ascending or descending order.
This can happen with the first couple of posts and has to do with the fact that when you first set up a site here it is on UTC/GMT time zone so the default first post will have the UTC/GMT timestamp. If you then set the time zone and create another post, then the timestamp on that post will be in your local time zone. The sort is by date and time numerically and does not take into account the actual timezone setting.
Edit one of the posts and change the published time so that it is in proper relationship to the other post. (publish module, Published on….).