1. Operators of trading venues shall ensure that their business clocks adhere to the levels of accuracy specified in Table 1 of the Annex according to the gateway to gateway latency of each of their trading systems.

Gateway to gateway latency shall be the time measured from the moment a message is received by an outer gateway of the trading venue's system, sent through the order submission protocol, processed by the matching engine, and then sent back until an acknowledgement is sent from the gateway.

2. By derogation from paragraph 1, operators of trading venues that operate a voice trading system, request for quote system where the response requires human intervention or does not allow algorithmic trading, or a system that formalises negotiated transactions in accordance with Article 4(1)(b) of Regulation (EU) No 600/2014 of the European Parliament and of the Council [Regulation (EU) No 600/2014 of the European Parliament and of the Council of 15 May 2014 on markets in financial instruments and amending Regulation (EU) No 648/2012 (OJ L 173, 12.6.2014, p. 84).] shall ensure that their business clocks do not diverge by more than one second from UTC referred to in Article 1 of this Regulation. The operator of the trading venue shall ensure that times are recorded to at least a one second granularity.

3. Operators of trading venues that operate multiple types of trading systems shall ensure that each system adheres to the level of accuracy applicable to that system in accordance with paragraphs 1 and 2.