Your Reddit "Cake Day" is the yearly anniversary of when you signed up on Reddit.
It is typically represented by a little cake icon which appears next to your username on Reddit,
and if it's your cake day, other Redditors tend to be more generous with their upvotes!
To find out when someone's cake day is, enter their Reddit.com username and press the "Discover Cake Day" button:
This nifty little tool was brought to you by Tom Chapin.