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When using %b or %B patterns to format a date, the code was simply using tm_mon as an index into array of month names. But that is wrong, because tm_mon is 1-based, while array indexes are 0-based. The result is we either use name of the next month, or a segfault (for December). Fix by subtracting 1 from tm_mon for both patterns, and add a regression test triggering the issue. Backpatch to all supported versions (the bug is there far longer, since at least 2003). Reported-by: Paul Spencer Backpatch-through: 9.4 Discussion: https://postgr.es/m/16143-0d861eb8688d3fef%40postgresql.org