Java Milliseconds in Year

Question

I am doing some date calculations in Java using milliseconds and noticing an issue with the following:

private static final int MILLIS_IN_SECOND = 1000;
             


        

Answer 1

private static final long MILLISECONDS_IN_YEAR = MILLIS_IN_SECOND * ...

All the operands on the right hand side are ints, so the multiplication is done with 32bit signed integers, which overflows. Cast the first one to long and you'll get the expected value.

private static final long MILLISECONDS_IN_YEAR = (long)MILLIS_IN_SECOND * ...