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    <p>Here's a solution that gives you the last second of the current month. You can extract the date part or modify it to return just the day. I tested this on SQL Server 2005.</p> <pre><code>select dateadd( s, -1, dateadd( mm, datediff( m, 0, getdate() ) + 1, 0 ) ); </code></pre> <p>To understand how it works we have to look at the <a href="http://www.w3schools.com/sql/func_dateadd.asp" rel="noreferrer">dateadd()</a> and <a href="http://www.w3schools.com/sql/func_datediff.asp" rel="noreferrer">datediff()</a> functions.</p> <pre><code>DATEADD(datepart, number, date) DATEDIFF(datepart, startdate, enddate) </code></pre> <p>If you run just the most inner call to datediff(), you get the current month number since timestamp 0.</p> <pre><code>select datediff(m, 0, getdate() ); 1327 </code></pre> <p>The next part adds that number of months plus 1 to the 0 timestamp, giving you the starting point of the next calendar month.</p> <pre><code>select dateadd( mm, datediff( m, 0, getdate() ) + 1, 0 ); 2010-09-01 00:00:00.000 </code></pre> <p>Finally, the outer dateadd() just subtracts one second from the beginning timestamp of next month, giving you the last second of the current month.</p> <pre><code>select dateadd( s, -1, dateadd( mm, datediff( m, 0, getdate() ) + 1, 0 ) ); 2010-08-31 23:59:59.000 </code></pre> <p><hr/> <strong>This old answer (below) has a bug where it doesn't work on the last day of a month that has more days than the next month. I'm leaving it here as a warning to others.</strong></p> <p>Add one month to the current date, and then subtract the value returned by the DAY function applied to the current date using the functions DAY and DATEADD.</p> <pre><code>dateadd(day, -day(getdate()), dateadd(month, 1, getdate())) </code></pre>
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    1. POHow do I calculate the last day of the month in SQL?
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    1. POHow do I calculate the last day of the month in SQL?
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    1. COWhat if the two getdate calls give answers in different dates?
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      1. USAmy B
    2. COI suppose that's possible. You'd have to declare a variable to hold today's date beforehand.
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    3. COThey won't. We create reports that generate year, quarter, month and rundate (GetDate()) columns that take 30 seconds and the value never changes.
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