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Doc: fix bogus to_date() examples.
November doesn't have 31 days. Remarkably, this thinko has escaped detection since commit 3f19987. Noted by Y. Saburov. Discussion: https://postgr.es/m/171276122213.681.531905738590773705@wrigleys.postgresql.org
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doc/src/sgml/func.sgml

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@@ -8401,11 +8401,11 @@ SELECT regexp_match('abc01234xyz', '(?:(.*?)(\d+)(.*)){1,1}');
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use some non-digit character or template after <literal>YYYY</literal>,
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otherwise the year is always interpreted as 4 digits. For example
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(with the year 20000):
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<literal>to_date('200001131', 'YYYYMMDD')</literal> will be
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<literal>to_date('200001130', 'YYYYMMDD')</literal> will be
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interpreted as a 4-digit year; instead use a non-digit
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separator after the year, like
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<literal>to_date('20000-1131', 'YYYY-MMDD')</literal> or
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<literal>to_date('20000Nov31', 'YYYYMonDD')</literal>.
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<literal>to_date('20000-1130', 'YYYY-MMDD')</literal> or
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<literal>to_date('20000Nov30', 'YYYYMonDD')</literal>.
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</para>
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</listitem>
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