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POAdding months to a date with keeping the last day of given month
 

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  1. POAdding months to a date with keeping the last day of given month
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    <p>Suppose that I have a date <strong>"Jan 31 2011"</strong> and I want to add a <strong>month</strong> to this date.</p> <p>New date is is okay <strong>"Feb 28 2011"</strong>, when I want to add a month again it gives me <strong>"March 28 2011"</strong>, but I need it to be <strong>"March 31 2011"</strong>. </p> <p>Oracle has a built-in function for that as Tony Andrews replied to this question,<br> <a href="https://stackoverflow.com/questions/397631/add-date-without-exceeding-a-month">Add date without exceeding a month</a></p> <p>But how to implement this function in PHP? (also MySQL solution is welcome)</p> <p><strong>edit #1</strong><br> @zerkms, this is the nearest answer thanks for your help. Here is the second deal</p> <p>I changed your solution a little bit to solve my real-life problem</p> <pre><code>SET @BEGINNING_DATE := '2011-01-30'; /* first date for payment */ SET @NEXT_END_DATE := '2011-02-28'; /* next date for payment (second payment deadline) */ /* now I want to find third payment deadline */ SELECT IF(@BEGINNING_DATE = LAST_DAY(@BEGINNING_DATE), LAST_DAY(DATE_ADD(@NEXT_END_DATE, INTERVAL 1 MONTH)), DATE_ADD(@NEXT_END_DATE, INTERVAL 1 MONTH)) </code></pre> <p>Your helpful solution gives me "2011-03-28" but I want to "2011-03-30". Any ideas?</p> <p><strong>edit #2</strong><br> Here is the solution with @zerkms' help. Thank you!</p> <pre><code>SET @BEGINNING_DATE := '2011-02-28'; /* first date for payment */ SET @NEXT_END_DATE := '2011-05-31'; /* next date for payment (second payment deadline */ SELECT IF(@BEGINNING_DATE = LAST_DAY(@BEGINNING_DATE), LAST_DAY(DATE_ADD(@NEXT_END_DATE, INTERVAL 1 MONTH)), CONCAT(YEAR(DATE_ADD(@NEXT_END_DATE, INTERVAL 1 MONTH)),'-',LPAD(MONTH(DATE_ADD(@NEXT_END_DATE, INTERVAL 1 MONTH)),2,'0'),'-',DAY(@BEGINNING_DATE))) </code></pre> <p><strong>edit #3</strong> Here is the exact solution. After dealing with some strange behaviours this is the exact solution</p> <pre><code>SET @@session.sql_mode = 'ALLOW_INVALID_DATES'; SET @BEGINNING_DATE := '2011-01-29'; /* first date for payment */ SET @NEXT_END_DATE := '2011-02-28'; /* next date for payment (second payment deadline) */ SELECT IF(@BEGINNING_DATE = LAST_DAY(@BEGINNING_DATE), LAST_DAY(DATE_ADD(@NEXT_END_DATE, INTERVAL 1 MONTH)), CONCAT(YEAR(DATE_ADD(@NEXT_END_DATE, INTERVAL 1 MONTH)),'-',MONTH(DATE_ADD(@NEXT_END_DATE, INTERVAL 1 MONTH)),'-',DAY(@BEGINNING_DATE)) + INTERVAL 0 MONTH) </code></pre>
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    1. COIn mysql you can do this `DATE_ADD('2006-05-00',INTERVAL 1 MONTH)` to add a month to a specified date
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    2. COWell, `27 feb 2011 + month == 27 march 2011`. `28 feb 2011 + month == 31 march 2011`. Is not it strange? What task are you trying to solve in this way?
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    3. COif you want the last day of next month look on http://stackoverflow.com/questions/3009896/get-the-first-and-last-date-of-next-month-in-mysql
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      1. USHaim Evgi
 

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