Article 4
Date and time recording
1. Operators of trading venues shall maintain a record of the date and time of the occurrence of each event listed in field 21 of Table 2 of the Annex to this Regulation with the level of accuracy specified by Article 2 of Commission Delegated Regulation (EU) 2017/574 (4) as specified in field 9 of Table 2 of the Annex to this Regulation. Except for the recording of the date and time of the rejection of orders by trading venue systems, all events referred to in field 21 of Table 2 of the Annex to this Regulation shall be recorded using the business clocks used by trading venue matching engines.
2. Operators of trading venues shall maintain a record of the date and time for each data element listed in fields 49, 50 and 51 of Table 2 of the Annex to this Regulation, with the level of accuracy specified by Article 2 of Delegated Regulation (EU) 2017/574.
(4) Commission Delegated Regulation (EU) 2017/574 of 7 June 2016 supplementing Directive 2014/65/EU of the European Parliament and of the Council with regard to regulatory technical standards for the level of accuracy of business clocks (see page 148 of this Official Journal).