Created attachment 22853 [details] patch fixing isADateFormat I have POI-generated excel with dateformat "dd.mm.yyyy". When I open it with my my Excel 2003 and save it back to disk, the dateformat is somehow changed to be "dd\.mm\.yyyy". HSSFDateUtils.isADateFormat does not recognize that as a date. Patch included fixes this, "\." is translated to "." just like currently "\," is translated to ",". Patch is for HSSFDateUtils.java in r707953, but I checked that DateUtils.java in current release has the same issue.
Fixed in svn