This notice is for consumers of the websocket api at https://www.bitmex.com/websocket/realtime.
For some time, timestamps sent via the websocket were in UNIX time (milliseconds since epoch) but timestamps sent via the REST API were sent as ISO time.
For consistency and minimum breakage, all timestamps sent via the websocket will now also be ISO time. This change will take effect at 14:00 UTC on Monday, September 7.
If you would like to test your tools, please connect to the BitMEX Testnet, where this change has already been made.
No change will be made to the REST API or to API Key authentication.