Contract number: [ complete ]  Contract conditions of December 2015  law, national law and collective agreements or by the international environmental, social  and labour law provisions listed in Annex X to Directive 2014/24/EU $^{3}$.  II.4.2 All periods specified in the contract are calculated in calendar days, unless  otherwise specified. II.4.3  The contractor must not present itself as a representative of the contracting  authority and must inform third parties that it is not part of the European public  service.  II.4.4 The contractor is responsible for the  personnel who perform the contract and  exercises its authority over its  personnel without interference by the contracting  authority. The contractor must inform its  personnel  that:  (a) they may not accept any direct instructions from the contracting authority; and  (b) their participation in providing the supplies does not result in any employment or  contractual relationship with the contracting authority.  II.4.5  The contractor must ensure that the  personnel performing the contract and any  future  replacement  personnel  possess  the  professional  qualifications  and  experience required to provide the supplies, as the case may be on the basis of the  selection criteria set out in the tender specifications.  II.4.6 At the contracting authority’s reasoned request, the contractor must replace any  member of  personnel  who:  (a) does not have the expertise required to provide the supplies; or  (b) has caused disruption at the premises of the contracting authority.  II.4.7 The contractor must record and report to the contracting authority any problem that  affects its ability to deliver the supplies. The report must describe the problem,  state when it started and what action the contractor is taking to resolve it.  (b) Date, time and place of delivery  (a) Time allowed for delivery  II.4.8 Delivery  The contractor bears the cost of replacing its  personnel  and is responsible for any  delay in providing the supplies resulting from the replacement of  personnel .  The time allowed for delivery is calculated in accordance with Article I.3.  The Commission must be notified in writing of the exact date of delivery within the period  indicated in Article I.3. All deliveries must be made at the agreed place of delivery during  the hours indicated in Article I.3.  $^{3}$  OJ L 94 of 28.03.2014, p. 65  13 