The Commission official response as per their document “Frequently Asked Questions on Project Management in Fp6” - March 2005, is:
“…The person in charge of the work designated by the contractor should certify the time sheets. Certified time sheets must include the person’s identity and its time spent on the project (the project needs to be identified by acronym and contract number as well). Productive hours must be calculated according to the contractor’s normal practices (taking into account particularly national holidays, illness, training, etc.).
Contractors may use a standard model for time sheets. The Commission does not provide any such model…”