Please refer to this profile: Nathan Srivi
The "member for" field on this profile page says "10 days", but he/she has posted several questions and answers that are more than 10 days old.
How did this happen?
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The profile history of that user says that he has 1 or more sock-pupets. Users action was detected by the moderator and all the sock-pupets has been removed. You can see this in his profile history for dated June 11 & June 26 section.
As per the rule one of his account remain active which is created by 10 days ago, that's why now his profile shows that account has been created 10 days ago but he has older posts within his merged profile.
You can also see the serial voteups on April 4, there may be many more which are now removed so we can't see them.
Hmmm, the comments are close, but no cigar. ;P
His account had been destroyed for whatever reason, and it was recreated, or better yet "undestroyed," on July 16. The process of re-assigning their posts is manual on the part of the devs, but aside from just making up a registration date or using their earliest post date, I doubt there's any way of determining the actual date they registered their previous account. Probably not something anyone is concerned about. So yeah, the dates are off...
I received this email from the Stack Overflow team:
I'm very sorry about the delay in getting back to you. It looks like your accounts were mistakenly identified as belonging to another user who was trying to circumvent some of the restrictions placed on his account.
I sincerely apologize for the inconvenience and confusion this has caused. If you create a new account one more time and send me the link to it, I will be happy to associate the posts you made under your previous accounts with it and make a note on it to explain the situation to the moderators who may be coming across your profile in the future.
Thank you for reviewing my profile.