Re: "A diagram of C23 basic types"

[ Just noticed this post while catching up in my backlog, so I'm not
  sure my questions/comments have already been addressed elsewhere. ]

On 16.04.2025 22:04, Scott Lurndal wrote:

[...]

 
Back in the mainframe days, it was common to use julian dates
as they were both concise (5 BCD digits/20 bits) and sortable.
 
  YYDDD
 
If time was neeeded, it was seconds since midnight in a reference
timezone.

I don't quite understand the rationale behind all that said above.

"YYDDD" was used without century information? How is that useful?
(I assume it's just the popular laziness that later lead to all the
Y2k chaos activities.)

And "seconds since midnight" where taken despite the Julian Dates
have a day start at high noon (12:00)? [*]

Janis

[*] I recall that e.g. SunOS also had that wrong and assumed start at
midnight. Folks generally don't seem to be aware of that difference.