Days play online

It is an application specialized only for management of remaining days.

For example, how many days have passed since the two year contract expiration date of a smartphone,
How many days after birthday, etc.

Setting iteratively every year,
When the remaining days are gone, we will renew the deadline automatically.
* When the deadline registered is February 29 of the leap year, the automatic carry forward will be set on February 28

If you set it without repetition,
When the remaining days are exhausted, it changes to the number of days elapsed.
It becomes the character color of gray in elapsed days notation.