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POConvert time back from UTC to specified TimeZone
 

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  1. POConvert time back from UTC to specified TimeZone
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    <p>Being entirely confused of what's going in with java time and why there are thousands of posts related to this I somehow managed to store time in UTC using jodaTime:</p> <pre><code>Calendar cal = new GregorianCalendar(); cal.setTimeInMillis(DateTimeZone.getDefault().convertLocalToUTC( cal.getTimeInMillis(), false)); </code></pre> <p>Since I am using hibernate(and not willing to use adapters for JodaTime to work correctly with version 4) I only use this jodaTime method to convert jdk time to utc. This seems to produce expected result and the local time(current london GMT+1) gets converted to UTC via subtracting 1 from this local time.</p> <p>So far so good. Then whenever I retrieve my time for specific timezone I get incorrect offset of -2 where it should be -3 including DST.</p> <blockquote> <p>Calendar cal = new GregorianCalendar();</p> <pre><code> System.out.println("Local London Hours: "+cal.get(Calendar.HOUR_OF_DAY)); System.out.println("Local London Milliseconds: "+cal.getTimeInMillis()); cal.setTimeInMillis(DateTimeZone.getDefault().convertLocalToUTC( cal.getTimeInMillis(), false)); System.out.println("UTC Hours: "+cal.get(Calendar.HOUR_OF_DAY)); System.out.println("UTC Milliseconds: "+cal.getTimeInMillis()); // Time for specific time zone cal.setTimeZone(TimeZone.getTimeZone("Europe/Vilnius")); System.out.println("Vilnius Hours: "+cal.get(Calendar.HOUR_OF_DAY)); System.out.println("Vilnius Milliseconds: "+cal.getTimeInMillis()); // is this time in DST? - Yes System.out.println("Vilnius time is in DST: "+TimeZone.getTimeZone("Europe/Vilnius").inDaylightTime(cal.getTime())); </code></pre> </blockquote> <p><a href="http://www.timeanddate.com/worldclock/city.html?n=660" rel="nofollow">http://www.timeanddate.com/worldclock/city.html?n=660</a> Time zone details for specific timezone</p> <p>Output:</p> <p>Local London Hours: 21</p> <p>Local London Milliseconds: 1381869901339</p> <p>UTC Hours: 20</p> <p>UTC Milliseconds: 1381866301339</p> <p>Vilnius Hours: 22 // <strong>this should be 23 (according to link)</strong></p> <p>Vilnius Milliseconds: 1381866301339</p> <p>Vilnius time is in DST: true // <strong>no, it is not since hours value is not 23</strong></p>
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