From Lotus Knowledegbase article # 151467

When the date format is wrong on the Domino console and text dates created by agents running on that server and the server is running on Windows NT as a service, this is due to the system locale being wrong (normally US) :

HKUSERS\.default\control panel\International\dDate is the seperator character for dates

HKUSERS\.default\control panel\International\iDate is the date format:

0=m/d/yy (US)
1=d/m/yy (UK)
2=yy/m/d (Japanese)

Restart the Domino service and the change will be picked up. Other time & date entries are under the same key.

(See file: Notes_Server_Date_Format.reg to set NT default locale to UK settings)