One day is the most important day.
One day is a new tab chrome extension that allows you mark your most memorable day.
You can set the most memorable day in the option page. And when you open a new tab, you will see how many days has passed or left.
Some typical scenarios include:
1. recording how many days have you met your girl friend;
2. how many days left to the next new year;
and something like that.
More features are under development.
If you have any good ideas, you are always welcome to send me an email.