Happy Rounded Pi Day To celebrate Rounded Pi Day, you must take advantage of today's date to make a program that takes in a circle's diameter and outputs its circumference by multiplying the diameter by 3.1416, where 3.1416 must be obtained using today's date.

Input 3
Output 9.4248
etc.


Does not take the date as input. You do not have to use all components of the date but the digits of pi must come from formatting a Date object or using a date object to obtain it. The answers so far look good.

Not sure what else to specify. All the answers so far meet what I was expecting.

My constraint was that you must use components of the date to come up with Pi. You can of course use the components, multiply by 0 then add 3.1416, but that's boring and wastes precious chars!

Shortest code wins!
C, 32 bytes

#define f(d)d*time(0)/464083315.


If losing a little more accuracy is fine, I can get it down to about 29 bytes being still accurate to 4 digits past the decimal (as of the time of this posting):

#define f(d)d*time(0)/46408e4