Product Defect 354605 - When using Irish/GB regional settings as a CA Operator, the web-client fails to export "TimeDetected" values to CSV and PDF files.
Given that this bug was with the web-client and has a very limited scope of impact, the product team has decided not to implement a fix for this issue at this time.
Workaround
You can use the Win32 client to export the report, or an Administrative account, or even a host that is using a US/English regional setting.