Add this template to your user page, with the year, month, and day your account was created. If you don't know the day your account was created, see your preferences here.
Usage
Leading zero before single-digit month or day, is at discretion of the user.
Sample code
Resulting infobox
{{User Wikipedian for|year=2001|month=01|day=15}}
This user has been on Wikipedia for 23 years, 3 months and 5 days.
