For the purpose of determining their period of validity, licences and certificates shall be considered to have been issued on the day on which the application for them was lodged, that day being included in the calculation of such period of validity. However, licences and certificates may not be used until their actual issue.

It may be specified that a licence or certificate is to become valid on its actual day of issue, in which case that day shall be included in the calculation of its period of validity.