Key features and functions of our Date Calculator includes:

1. Days:

   It calculates the duration between two dates in terms of days.

2. Weeks + Days:

   It calculates the duration between two dates in terms of weeks and days.

3. Months + Days:

   It calculates the duration between two dates in terms of months and days.

4. Years + Months + Days:

   It calculates the duration between two dates in terms of years,months and days.