On Wed, 13 Dec 2017, Noel Chiappa wrote:

   > into the simulated computer's time of day clock.

What Time of Day clock? We're talking PDP-11's here! :-)

On V6 at least, the time was set from the mod time (?) in inode #1, as I vaguely recall, so it was "pretty close".  My memory is *really* dim here...  Or was that one of the zillions of custom mods at the time?.