There are a few reasons why you might want to know when someone joined Instagram or when you joined Instagram. For example, it could be for business reasons, advertising, management or just out of curiosity.
How to See When Someone Joined Instagram | When the account was created
Sometimes you can deduce when an account was created by looking at someone's posts and carefully checking the dates. But there are also other more informed ways to check the date of creation of an account!
For this method, you must either be the user of the account or follow the account (if the account is private). If the account is a public profile, anyone can access this information.
This is the most official, easy and effective way to find the account creation date! To follow an account, make sure you've pressed the blue button right below their profile and that you've had your request accepted if they're private.