Here's a generic sample of a file that would have two events. In this example, Splunk would've read the epoch "date" field correctly for one but given the other one an indexed time timestamp.
{"message”:”Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Platea dictumst vestibulum rhoncus est. Mattis rhoncus urna neque viverra justo. Justo eget magna fermentum iaculis eu non diam phasellus. Morbi tempus iaculis urna id volutpat lacus laoreet.“,”type”:”bType”,”level":"INFO","details":{},"date":1585769642062}
{"message”:”blah blah blah”,”type”:”aType”,”level":"INFO","details":{},"date":1585769641953}
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