You could check that some how, but unless you know let's say when the account 1005 was created, you can estimate when the 1150 was (probably on the same day/week)
I am more like interested to guess the year, so this should narrow the search somehow. But how do I know which number reprezents what year.
These numbers don't represent date when account was created. It's just a number of user.
For example, Satoshi have user ID 3, it means that he is 3rd registered user on forum. Your account on forum is 1245994th. It means that there are more than 1.2 milkion registered users.