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.

Sample code Resulting infobox
{{User Wikipedian for|year=2001|month=01|day=15}}
This user has been on Wikipedia for 23 సంవత్సరాలు, 9 నెలలు , 19 రోజులు.
{{User Wikipedian for|year=2001|month=01|day=15|link=true}}
This user has been on Wikipedia for 23 సంవత్సరాలు, 9 నెలలు , 19 రోజులు.
{{User Wikipedian for|year=2001|month=01|day=15|diff=http://en.wikipedia.org/w/index.php?title=Special%3ALog&type=newusers&user=&page=Example}}
This user has been on Wikipedia for 23 సంవత్సరాలు, 9 నెలలు , 19 రోజులు.
Adding a serial comma:
{{User Wikipedian for|year=2001|month=01|day=15|sc=y}}
This user has been on Wikipedia for 23 సంవత్సరాలు, 9 నెలలు, and 19 రోజులు.