> I never saw a need for this in HFT. In my experience, GPS was used instead, but there was never any critical need for microsecond accuracy in live systems.

mifid ii (uk/eu) minimum is 1us granularity

https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv:...

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throw0101c an hour ago | parent | next [-]

> mifid ii (uk/eu) minimum is 1us granularity

1us is nothing special for GPS/NTP/PTP appliances (especially with OCXO/rubidium oscillators):

* https://www.microchip.com/en-us/products/clock-and-timing/sy...

* https://www.meinbergglobal.com/english/productinfo/gps-time-...

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dmurray 5 hours ago | parent | prev [-]

It's 1 us granularity, which means you should report your timestamps with six figures after the decimal point.

The required accuracy (Tables 1 and 2 in that document) is 100 us or 1000 us depending on the system.

	▲	blibble 5 hours ago \| parent [-]
		> The required accuracy (Tables 1 and 2 in that document) no, Tables 1 and 2 say divergence, not accuracy accuracy is a mix of both granularity and divergence regardless, your statement before: > The regulatory requirement you linked (and other typical requirements from regulators) allows a tolerance of one second, so it doesn't call for this kind of technology. is not true