[HECnet] DECnet-10 doesn't work past Nov 9 2021?

[John Forecast]

> On Dec 27, 2020, at 11:46 AM, Robert Armstrong <bob at jfcl.com> wrote:
> 
>   This topic came up on the alt.sys.pdp10 list
>  
>                https://groups.google.com/g/alt.sys.pdp10/c/ZttQxHZGEJQ <https://groups.google.com/g/alt.sys.pdp10/c/ZttQxHZGEJQ>
>  
> Apparently DECnet-10 won’t work past November 9th 2021, which isn’t that far away.   Personally I’d never heard this before and had no idea, and since I know there are a few 36 bit emulations on HECnet that are obviously using DECnet I thought I’d pass it along.
>  
>   TOPS20 isn’t explicitly mentioned, but I’m guessing that it has the exact same issue.  That’d mean no DECnet on 36 bit systems after next year!  Unless, of course, you want to start playing games with the date (which I hate doing)…
>  
> Bob

It’s not just a DECnet-10/20 problem. DECnet event logging for any system may fail after Nov 9th 2021. Events are time-stamped when they are generated with a 2-byte field holding the number of half julian days since Jan-1 1977. The spec (Network Management 4.0.0, page 170/171) implies that these 2 bytes should be treated as a signed value (0 - 32767) which will overflow on Nov 9th 2021. If the code treats it as unsigned, then we’re good for another 44 years. I wrote most of the RSX and Ultrix event logging code but I don’t remember if that field was treated as signed or unsigned. Phase V fixed the problem allowing the time stamp to go well past the year 9999.

  John.

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