Benchmark tests are setting incorrect date

I'm assigning this issue to you Martin because I can't see pmacik in "Assign to" pop up list.
I found that benchmark tests QA team provided us are failing every last day in every month.
The tests are trying to set up e.g. 32-nd of March as valid date.

I can see this failure locally when running our test suite today (31-st of March):
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[INFO] Surefire report directory: /home/opalka/svn/jbossws/stack/native/trunk/modules/testsuite/framework-tests/target/surefire-reports
org.apache.maven.surefire.booter.SurefireExecutionException: null; nested exception is java.lang.ExceptionInInitializerError: null
java.lang.ExceptionInInitializerError
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.apache.maven.surefire.testset.PojoTestSet.<init>(PojoTestSet.java:55)
at org.apache.maven.surefire.junit.JUnitDirectoryTestSuite.createTestSet(JUnitDirectoryTestSuite.java:64)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.locateTestSets(AbstractDirectoryTestSuite.java:96)
at org.apache.maven.surefire.Surefire.createSuiteFromDefinition(Surefire.java:209)
at org.apache.maven.surefire.Surefire.run(Surefire.java:156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:345)
at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1009)
Caused by: java.lang.IllegalArgumentException: Invalid value 32 for Day field.
at org.apache.xerces.jaxp.datatype.XMLGregorianCalendarImpl.checkFieldValueConstraint(Unknown Source)
at org.apache.xerces.jaxp.datatype.XMLGregorianCalendarImpl.setDay(Unknown Source)
at org.jboss.test.ws.jaxws.benchmark.test.datatypes.unwrapped.pojo.CalendarRPCTest.<clinit>(CalendarRPCTest.java:60)
... 17 more
[ERROR] There are test failures.