<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Yes, I've thought about it some more; you have to be right.</p>
<p>I had to do some research into Tops-20's internal date and time
format in order to do special pages right for FTP (see previous)
and I went back to the DAYTIME module in the monitor to see what's
going on. What happens is that the internal date and time isn't
changed at all; a table triggers a formatting change to switch to
Daylight Saving Time. Given what I knew about the EXEC, I should
have remembered that. Oh well.<br>
</p>
<div class="moz-cite-prefix">It follows that this is what the C
library is probably be doing. If you change the internal system
time, then you can get either a gap or overlap in accounting
records which can drive billing systems crazy.<br>
</div>
<blockquote type="cite"
cite="mid:679e5a71-5941-aca3-90e3-7b43740813c5@softjar.se">
<hr width="100%" size="2">On 3/8/20 5:37 PM, Johnny Billquist
wrote:<br>
<br>
NTP does actually not solve this at all. NTP does all time in UTC.
It's up to the local machine to figure out if DST is applicable or
not, and how to apply it.<br>
<blockquote type="cite">
<hr width="100%" size="2">On 2020-03-08 22:28, Thomas DeBellis
wrote: <br>
<br>
A lot of that has changed nowadays with NTP clients; even if the
base operating system doesn't support time change, an NTP client
can address that. So all my systems advanced appropriately, as
did an old radio clock. I'm not sure how *nix does it, but I
don't remember Ultrix having the code on our 8650 (or 8700).
Tops-20 will do the change whether or not a client exists as the
code is in the monitor.
<br>
</blockquote>
</blockquote>
May I ask what version of NTP do you support and do you handle
authenticated connections? The 20 has an Internet time
synchronization program, but is quite primitive (the algorithm first
being supported by ITS). I'm not dissatisfied enough to write my
own NTP. Yet...<br>
<blockquote type="cite"
cite="mid:679e5a71-5941-aca3-90e3-7b43740813c5@softjar.se">
<hr width="100%" size="2">My NTP client, by the way, is in fact
written in C. But it is my own implementation, and not something
picked up from somewhere else.
<br>
<br>
Johnny
<br>
</blockquote>
</body>
</html>