Method floorMod

base/src/main/java/net/time4j/PlainTime.java:2043–2054

(
        long value,
        long divisor
    )

    }

    private static long floorMod(
        long value,
        long divisor
    ) {

        long num =
            (value >= 0)
            ? (value / divisor)
            : (((value + 1) / divisor) - 1);
        return (value - divisor * num);

    }

    private static long floorDiv(
        long value,