The NACC is the Ultimate N.A. Cleantime Calculator.
The NACC uses modern, standards-based Web coding techniques, and low-specificity CSS styling, which means that you can easily change the appearance of the calculator to “mesh” with your site theme.
The current version of the NACC is 2.0.10 (Fixes a problem with dates before March in non leap-years).
We now have an Apple iPhone/iPad App!