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    <p>According to the POSIX.1-2001 standard, next month (as in incrementing <code>tm_mon</code> before calling <code>mktime</code>) is done by adjusting the values until they fit. So, for example, next month from January 31, 2001 is March 3, 2001. This is because the <code>tm_mday</code> of 31 isn't valid with <code>tm_mon</code> of 1 (February), so it is normalized to <code>tm_mon</code> of 2 (March) and <code>tm_mday</code> of 3.</p> <p>The next month from January 31, 2000 is March 2, 2000, because Feb. has 29 days that year. The next month from January, 1 2038 doesn't exist, depending.</p> <p><a href="http://xkcd.com/927/" rel="nofollow">The great thing about standards is there are so many to chose from</a>. Check the SQL standard, I bet you can find a different meaning of next month. I suspect ISO 8601 may give you yet another choice. Point is, there are many different behaviors, the meaning of 'next month' is very domain-specific.</p> <p>edit: I <em>think</em> I've found how SQL-92 handles it, apparently asking for next month from January 31 is an error.</p> <p>Links:</p> <ul> <li>SQL-92: <a href="http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt" rel="nofollow">http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt</a></li> <li>POSIX: <a href="http://pubs.opengroup.org/onlinepubs/9699919799/" rel="nofollow">http://pubs.opengroup.org/onlinepubs/9699919799/</a> (though apparently that version now defers to ISO C, which doesn't seem as clear. The mktime manpage on my machine is clear, though)</li> <li>ISO C: <a href="http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf" rel="nofollow">http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf</a></li> <li>Java: <a href="http://download.oracle.com/javase/6/docs/api/java/util/Calendar.html" rel="nofollow">http://download.oracle.com/javase/6/docs/api/java/util/Calendar.html</a></li> </ul>
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    1. POStandards for Date/Time addition?
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    1. POStandards for Date/Time addition?
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    1. CO+1 Interesting. I think the point of this question is not so much to find *one* standard but to find out which ones are likely used, and which library adheres to which one. Do you know any documentation that defines the behaviour of `POSIX.1-2001`?
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    2. CO@derobert, Good answer. Do you have a link? There are about as many standards as there are answers from people on the street. No widely accepted standard for sure, and the answers from this POSIX standard are such as no human would expect.
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    3. CO@JonathanM: Added some links.
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