Compile-time constant expressions that overflow are a potential source of bugs.
Literals without an explicit L suffix have type int, so the following
multiplication expression is evaluated as an integer before being widened to
long. The value is greater than Integer.MAX_VALUE, so it wraps around to
-1857093632.
static final long NANOS_PER_DAY = 24 * 60 * 60 * 1000 * 1000 * 1000;
The intent was probably for the multiplication expression to be evaluated as a
long instead of an int.
static final long NANOS_PER_DAY = 24L * 60 * 60 * 1000 * 1000 * 1000;
If you find yourself doing this kind of time-based math, consider using an API
that provides a safer, more readable and strongly-typed solution like the
java.time.Duration
API.
Suppress false positives by adding the suppression annotation @SuppressWarnings("ConstantOverflow") to the enclosing element.