According to executive order no. 676/2015, the ship owner must not impose work on seafarers on Sundays and holidays that could be delayed. It is, however, possible for the ship owner and the seafarer to agree otherwise. As a matter of proof, such an agreement should be in writing and, if possible, be signed by both parties. The term "holiday" refers only to Danish public holidays and not to other holidays in ports in countries where the vessel is berthed or to other holidays in a non-Danish seafarer’s home country. Naturally, work concerning the safety or uninterrupted operation of the vessel must be regarded as work that cannot be delayed. It is assumed, however, that the same applies to work the postponement of which would affect or significantly inconvenience others on board or the service.