[TUHS] DECtapes under the UNIX room floor

[Erik E. Fair via TUHS]

I have a tickle in my memory that the Unix V7 (or 2BSD?) answer to a lack of battery-backed ToD/ToY RTC was using the last modify date of inode #2 in the root filesystem as "close enough for government work" precisely because that'd be the last one modified in a clean shutdown, and definitely better than starting time_t zero (epoch: 00:00 Jan 1 1970 GMT).

There was also the issue for many years of having to kill cron before doing a big delta time change: cron would wake up suddenly hours or days later than it thought the last time it had run, and would spawn all work it needed to run to "catch up" ...

	Erik