Hi Olivier,
Sorry, I don't remember which versions of Java go with which versions of MII, but suspect the fix may be with going to Java 1.6.
Most of the threads which were relevant to MII and Daylight Savings Time were from two or more years ago which would be consistent with your version of MII.
If I have some time today, I will see if I can find some of the relevant Discussions.
Cheers, Mike
SAP Customer Experience Group - CEG