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    <p>First day of the month + 1 month should equal the first of the next month. Trying this on SQL Server</p> <pre><code> SELECT CAST ('01/01/2012' AS DateTime), DATEADD (m, 1, '01/01/2012') UNION ALL SELECT CAST ('02/01/2012' AS DateTime), DATEADD (m, 1, '02/01/2012') UNION ALL SELECT CAST ('03/01/2012' AS DateTime), DATEADD (m, 1, '03/01/2012') UNION ALL SELECT CAST ('04/01/2012' AS DateTime), DATEADD (m, 1, '04/01/2012') UNION ALL SELECT CAST ('05/01/2012' AS DateTime), DATEADD (m, 1, '05/01/2012') </code></pre> <p>This results in</p> <pre><code>----------------------- ----------------------- 2012-01-01 2012-02-01 2012-02-01 2012-03-01 2012-03-01 2012-04-01 2012-04-01 2012-05-01 2012-05-01 2012-06-01 </code></pre> <p>Last day of this month + 1 month should equal last day of next month. This should go for next month, current month, 10 months down, etc. </p> <pre><code> SELECT CAST ('01/31/2012' AS DateTime), DATEADD (m, 1, '01/31/2012') UNION ALL SELECT CAST ('01/30/2012' AS DateTime), DATEADD (m, 1, '01/30/2012') UNION ALL SELECT CAST ('01/29/2012' AS DateTime), DATEADD (m, 1, '01/29/2012') UNION ALL SELECT CAST ('01/28/2012' AS DateTime), DATEADD (m, 1, '01/28/2012') UNION ALL SELECT CAST ('01/27/2012' AS DateTime), DATEADD (m, 1, '01/27/2012') UNION ALL SELECT CAST ('01/26/2012' AS DateTime), DATEADD (m, 1, '01/26/2012') </code></pre> <p>This results in</p> <pre><code>----------------------- ----------------------- 2012-01-31 2012-02-29 2012-01-30 2012-02-29 2012-01-29 2012-02-29 2012-01-28 2012-02-28 2012-01-27 2012-02-27 2012-01-26 2012-02-26 </code></pre> <p>See how 31, 30, 29 all become feb 29 (2012 is a leap year).</p> <p>p.s. I took off the time parts (all zeroes) to help make it more readable</p>
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    1. POStandards for Date/Time addition?
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    1. USRaj More
    1. USRaj More
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    1. COI'm really looking for a standards based answer on this, rather than a pool of opinions.
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    2. CO@preinheimer, It *has* to be a pool of opinions, because if you ask the question to folks out on the street, you're going to get varying answers. They're not bound by any standard out there. And since date software must model real life interpretations of units of time, the software must either clarify expectations or clearly define how *it* will interpret such phrases.
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    3. COWhat about 2nd-to-last day of this month? What's next month from January 29th, 2001? Is "next month" symmetrical with "last month"?
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