event_time field from the Prime Websocket API is returned in ISO 8601 with microseconds. Make sure you can parse the following ISO 8601 format. Most modern languages and libraries handle this without issues.
timestamp field from the Prime Websocket API is returned in RFC3339Nano format. This format usually has nanosecond precision, but if trailing zeros are present, they are removed.
2016-01-19T15:32:32.123456700Z becomes 2016-01-19T15:32:32.1234567Z
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