EVDominoExporter and date range

Hello again ..

Tool works great with this command ..

D:\Program Files (x86)\Enterprise Vault>EVDominoExporter.exe /A "evtest/BEST GB" /O "Bestmail01/Best GB!!mail\evtest.nsf" /I "C:\IDfiler\user.id" /P password

But when I use time span like this . . it will not work

D:\Program Files (x86)\Enterprise Vault>EVDominoExporter.exe /A "evtest/Best GB" /O "Bestmail01/Best GB!!mail\evtest.nsf" /I "C:\IDfiler\user.id" /P password /R “Default Retention Category” /SD “1/1/2007 23:00:00” /ED 31/12/2007 23:00”

 ... is a restriction on the time-span?

grateful for any suggestions ;O)

regards

/Bo