As Derek notes in this topic, negative epoch timestamps denote dates before 1970. In milliseconds, -61566219300000 corresponds with January 16, 0019 at 7:28 PM, but in seconds, it matches January 19, 1968 at 5:16 AM, which makes much more sense. Make sure that all UNIX timestamps are formatted in milliseconds, per this documentation.
That said, which portal are you querying? I see there are several accounts associated with fivetran.com.
As Derek notes in this topic, negative epoch timestamps denote dates before 1970. In milliseconds, -61566219300000 corresponds with January 16, 0019 at 7:28 PM, but in seconds, it matches January 19, 1968 at 5:16 AM, which makes much more sense. Make sure that all UNIX timestamps are formatted in milliseconds, per this documentation.
That said, which portal are you querying? I see there are several accounts associated with fivetran.com.