For reports related to RTCP packets, for instance, this indicates the time at which the data covered by the statistics was received at the corresponding endpoint.
The time is given in milliseconds elapsed since the UNIX epoch (the first moment of January 1, 1970, UTC).
var timestamp = RTCStats.timestamp;
DOMHighResTimeStamp value indicating the time at which the activity
described by the statistics in this object was recorded, in milliseconds elapsed since
the beginning of January 1, 1970, UTC. This should be accurate to within a few
milliseconds but may not be entirely pricise, either because of hardware or operating
system limitations or because of fingerprinting protection in the form of reduced clock
precision or accuracy.
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