Code Duplication    Length = 3-3 lines in 2 locations

src/Dontdrinkandroot/Date/FlexDate.php 2 locations

@@ 121-123 (lines=3) @@
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     */
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    public function assertValid()
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    {
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        if (null !== $this->day && null === $this->month) {
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            throw new \Exception('Day set, but no month');
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        }
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        if (null !== $this->month && null === $this->year) {
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            throw new \Exception('Month, but no year');
@@ 125-127 (lines=3) @@
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            throw new \Exception('Day set, but no month');
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        }
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        if (null !== $this->month && null === $this->year) {
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            throw new \Exception('Month, but no year');
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        }
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        return true;
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    }