You are multiplying ints
together, and overflow occurs because the maximum integer is 2^31 - 1
. Only after the multiplications does it get converted to a long
. Cast the first number as a long
.
long days_30 = (long) 1000 * 60 * 60 * 24 * 30;
or use a long
literal:
long days_30 = 1000L * 60 * 60 * 24 * 30;
That will force long
math operations from the start.
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