On Tue, Jul 27, 2021, 4:03 AM grarpamp <[1]grarpamp@gmail.com> wrote:

     On 7/26/21, Karl <[2]gmkarl@gmail.com> wrote:
     > # I'm imagining that data is communicated via server timestamps
     >
     > ~ $ TZ=GMT date; curl -v [3]google.com; TZ=GMT date
     > Mon Jul 26 23:03:59 GMT 2021
     > < Date: Mon, 26 Jul 2021 23:04:06 GMT
     > Mon Jul 26 23:04:01 GMT 2021
     >
     > # google is 5-7 seconds ahead of me right now
     That assumes you are correctly in sync with UTC.

   Yeah phones sync kinda loosely.  But it's notable the clocks their
   network syncs with are likely the atomic ones on gps satellites.
   I'm thinking timestamps help correlate things in logs.
   tlsdate is pretty cool.  Well studied, widely available protocol.
   Doesn't form records around skew, though.

References

   1. mailto:grarpamp@gmail.com
   2. mailto:gmkarl@gmail.com
   3. http://google.com/