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POMySQL - how to store time with correct timezone? (from Java)
 

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  1. POMySQL - how to store time with correct timezone? (from Java)
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    <p>I'm using MySQL 5.0. I need to store date-time information in one column. I mean to use <code>DATETIME</code> or <code>TIMESTAMP</code> column type. But I have problem with summer-winter time change.</p> <p>My timezone is CET. In summer we use summer-time (CEST, it is GMT+2) and in winter we use winter-time (CET, it is GMT+1). In the day when the summer time changes into winter time (in this year 2012 it was on 28th of October) we have time 2:00AM two-times. The sequence of time in this day is:</p> <pre><code>... -&gt; 1:00 CEST -&gt; 2:00 CEST -&gt; 2:00 CET (= 3:00 CEST) -&gt; 3:00 CET -&gt; ... </code></pre> <p>So if I have timestamp/datetime '2012-10-28 02:00:00' I'm not able to say correctly if this time represents 2:00AM in summer time or in winter time.</p> <p>I have two different Java dates:</p> <pre><code>Date d1 = new Date(1351382400000); // 2:00 CEST (summer-time) Date d2 = new Date(1351386000000); // 2:00 CET (winter-time) </code></pre> <p>And when I store them in the database using standard timestamp/datetime format (ie. <code>'yyyy-MM-dd HH:mm:ss'</code>), both of them store the same data '2012-10-28 02:00:00'. But when I get these values from database back into Date variables I get two same dates. So input dates were different but output dates are equal.<br /> The same occurs if I use the <code>FROM_UNIXTIME</code> function to store date value: <code>FROM_UNIXTIME(1351382400)</code> and <code>FROM_UNIXTIME(1351386000)</code>. Values are stored in the database column (DATETIME or TIMESTAMP type) as equal values. So when I get these values into Java's Date object I get two equal dates again (in winter time).</p> <p>Is there any way to store the timezone in MySQL, or how to handle with timezone information within DATETIME/TIMESTAMP columns?<br /> Of course I can store BIGINT values in the database with unix-timestamp. But I'm wondering if there's any way how to solve this problem with any MySQL date-time type.</p> <p>Any help or trick is appreciated ... :)</p> <p>Thanks a lot.</p> <p>Honza (sporak)</p> <p><strong>EDIT #1:</strong><br /> If I tried to store timestamp values and then fetch this timestamp values into java's Date, I get faulty Date again. Let's say I have simple table with TIMESTAMP column. I store data in this table this way:</p> <pre><code>mysql&gt; INSERT INTO `tab` (timestamp_column) VALUES (FROM_UNIXTIME(1351382400)), // 2:00 CEST (summer-time) (FROM_UNIXTIME(1351386000)); // 2:00 CET (winter-time) Query OK, 2 rows affected (0.00 sec) Records: 2 Duplicates: 0 Warnings: 0 </code></pre> <p>When I fetch these rows into java Date object, I'm getting two same dates that shows 2:00 CET. And what's more - when I fetch these rows in MySQL I get wrong values again in MySQL:</p> <pre><code>mysql&gt; SELECT UNIX_TIMESTAMP(timestamp_column) from tab; +--------------------+ | UNIX_TIMESTAMP(ts) | +--------------------+ | 1351386000 | | 1351386000 | +--------------------+ 2 rows in set (0.00 sec) </code></pre> <p>So TIMESTAMP seems to me to be little useless.</p>
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