सप्ताह का दिन कैलकुलेटर

$w = \left(y' + \left\lfloor \frac{y'}{4} \right\rfloor - \left\lfloor \frac{y'}{100} \right\rfloor + \left\lfloor \frac{y'}{400} \right\rfloor + t_m + d\right) \bmod 7$

$\text{leapYear} = (y \bmod 400 = 0) \lor ((y \bmod 4 = 0) \land (y \bmod 100 \ne 0))$