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POSpring @DateTimeFormat conversion error with Daylight Saving Time
 

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  1. POSpring @DateTimeFormat conversion error with Daylight Saving Time
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    <p>I'm using Spring MVC on a machine that has Daylight Saving Time configured (America/Sao_Paulo Time Zone). In my form class I used the annotation DateTimeFormat to configure the output of my Date:</p> <pre><code>public class JustificativaOcorForm { ... @NotNull @DateTimeFormat(pattern="yyyy-MM-dd") private Date dataMarcacao; ... } </code></pre> <p>While debugging I'm getting the date 16/10/2011 (dd/MM/yyyy) that's the start of the daylight time, but Spring converts it to 2011-10-15. Why?</p> <pre><code>2011-11-04 16:35:31,965 [http-8080-Processor25] DEBUG org.springframework.core.convert.support.GenericConversionService - Converting value Sun Oct 16 00:00:00 BRST 2011 of [TypeDescriptor @javax.validation.constraints.NotNull @org.springframework.format.annotation.DateTimeFormat java.util.Date] to [TypeDescriptor java.lang.Long] 2011-11-04 16:35:31,965 [http-8080-Processor25] DEBUG org.springframework.core.convert.support.GenericConversionService - Converted to 1318730400000 2011-11-04 16:35:32,010 [http-8080-Processor25] DEBUG org.springframework.core.convert.support.GenericConversionService - Converted to '2011-10-15' </code></pre> <p>I see this question: <a href="https://stackoverflow.com/questions/7817898/datetimeformat-in-spring-produces-off-by-one-day-error">@DateTimeFormat in Spring produces off-by-one day error</a></p> <p>but Spring 3 uses Joda-Time and I have joda-time-2.0.jar in my classpath so I don't know why this occurs and how I can solve it.</p> <p><strong>[EDIT]</strong></p> <p>I've tested creating LocalData objets, and found something:</p> <pre><code>LocalDate ld = new LocalDate( new SimpleDateFormat("dd/MM/yyyy").parse("16/10/2011").getTime() ); System.out.println( new SimpleDateFormat("dd/MM/yyyy HH:mm:ss Z z").format( ld.toDate() ) ); //prints 15/10/2011 00:00:00 -0200 BRST LocalDate ld2 = new LocalDate( 2011,10,16 ); System.out.println( new SimpleDateFormat("dd/MM/yyyy HH:mm:ss Z z").format( ld2.toDate() ) ); //prints 16/10/2011 00:00:00 -0200 BRST </code></pre> <p>It seems that the first approach is thinking that the time is in UTC, because debugging I can see that Joda use the method convertUTCToLocal of the class DateTimeZone.</p> <p>Maybe this is the default of the Spring too, he expect's one date in UTC too and i am passing the BRT Date.</p> <p>So I think my solution is change the objects to LocalDate and use the second way to create the instance of this object.</p>
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    1. USSérgio Michels
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      1. POSpring @DateTimeFormat conversion error with Daylight Saving Time
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    1. COIt's not clear - are you converting *to* a string, or *from* a string? Also, if this is only meant to be a date, it would be better to use Joda's `LocalDate` type.
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      1. USJon Skeet
    2. CO@JonSkeet it's a Date to String. I can set LocalDate with @DateTimeFormat?
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      1. POSpring @DateTimeFormat conversion error with Daylight Saving Time
      1. USSérgio Michels
    3. COI'd certainly expect so. Note that your `Date` value appears to be midnight *BRST* on October 16th... is that deliberate? Admittedly it's odd that that gets formatted as October 15th... but it would be generally better to avoid time zones entirely if you're using dates :)
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      1. POSpring @DateTimeFormat conversion error with Daylight Saving Time
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