I was new at a company that did this. We had to submit weekly timesheets. No one told me the procedure but I figured, everyone attended so I figured marking down 30 minutes (out of 60) on the time on the timesheet billed to the company was a fair deal.

A few days later a company-wide email was sent out specifying that these trainings were optional and not to be billed to the company.

They did pay me for the time though that time.