Which one of the following is not true?

Formula to calculate day :

(year code+Month code+Century code+Date Number-Leap year code) mod 7.

Year code:

$$(YY+(YY\div4)) mod 7$$

Here,for 1600th year,

$$(00+(00/4))mod7$$=00.

year code is 0.

Month code:

from January to December the month codes are as : 033614625035(we know it).

here month code is 5.

Century Code:

Century code for 1600 years is 6.

So, required date would be at=(0+5+6+31-0)mod 7=0(as 1600 is a leap year and month is not in January or February so we will subtract 0).

So, it will be Sunday not Saturday.

D is correct choice.