Operating systems of the 1970s handling dates beyond the year 2000

[J. David Bryan]

On Sunday, January 18, 2015 at 20:04, Mark Longridge wrote:

> So, did any operating system programmers from this time period have
> the foresight to use 4 digits for the year?

It's just outside of your time frame (circa 1980), but the HP 64000 
operating system allowed years up to 2157 (dates were stored as the number 
of days since January 1, 1976) and accepted years of either two or four 
digits.  Unusually for an American product, it required dates to be entered 
in D/M/Y format.

                                      -- Dave