As requested in comments of bug# 14375 ("[PATCH] Fix for reading files that use 1904 date windowing"), here are unit tests for the date conversion in HSSFDateUtil and the correct use of that conversion in HSSFCell based on the detection of the type of windowing used by the particular workbook file. Attachments include patch & new test data files (files created by Excel).
Created attachment 4030 [details] Patch file w/ additions to TestHSSFCell and TestHSSFDateUtil
Created attachment 4031 [details] New data files needed for the unit test; bz2 compressed tar archive; place files in src/testcases/org/apache/poi/hssf/data/
applied. Thanks.