Milliseconds Formatted in Visual Studio Not Displaying When Deployed to Report Server

I have designed a report that displays time down to milliseconds using Format(Parameters.TripTimeStampStr, "yyyy-MM-dd HH.mm.ss.fff"). This works in BIDS/Visual Studio but not when I deploy the report to the report server.

For some reason the time displays up to the second but the milliseconds are ".000". Any suggestions?

I have just noticed that the time is actually in string format so will try adding CDate() to the expression but it is strange that something that works in the report project doesn't work when deployed.

[EDIT] CDate() didn't make any difference.

R Campbell