This app show how long three members of your family (such as partner, sons or pets) has been together to you. It shows even if is the same day of the month or of the year that you meet the person or the pet for the first time, until a max value of 9007199254740991 days.

For the usage, please see the options settings in the fitbit aopp of the smartphone.

Versa version has been tested using fitbit os simulator, as fitbit team as told me.