[NMLUG] What time is it in Google land?

[kelly.terry.jones at gmail.com (Kelly Jones)]

I use gmail (well, duh!) and noticed that the URLs for my emails end
in "th=string" (for example, "th=1140e47e9abdcba5"), where string
appears to be a timestamp of some sort.

Does anyone know if this is a timestamp, and, if so, how to convert it
to Unix time?

My minimal effort shows it might be the number of nanoseconds (in hex)
since circa 5 Mar 1968, but this doesn't make sense, unless that's the
birthday of Google's founder or something.

I know M$ uses a similar format, which is actually a standard: the
number of 100ns intervals since midnight GMT on 1 Jan 1601 or
something like that.

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