I am trying to export database reports to excel files and whenever i have to put a date > Jan,1,2000 into a cell the call to HSSFDateUtil.getExcelDate((java.util.Date)CO) returns -1.0. the date Dez,31,1999 works. Anything beyond that date does not work.
Sorry folks, forget it please! It's been my fault. I accidentally took the date's display-string where the year is truncated to the last two digits instead of the real date with full 4 digits year.