Matthew Petach <mpetach@netflight.com>:

On Sun, Mar 10, 2019 at 8:04 PM Stephen Satchell <list@satchell.net> wrote:

...

So far as I can tell with NTP, there was no issue with time sources becoming false-tickers, including my local GPS appliance. FWIW.

I believe the rollover is *next* month, in April. :) https://ics-cert.us-cert.gov/sites/default/files/documents/Memorandum_on_GPS...

"This paper is intended to provide an understanding of the possible effects of the April 6, 2019 GPS Week Number Rollover on Coordinated Universal Time derived from GPS devices."

I'm a domain expert in this area - lead of NTPsec and GPSD. Everything said in that memo is correct. I would add only that it is more normal now than not for GPSes to have a hidden pivot date. "For example, a particular GPS device may interpret the WN parameter relative to a firmware creation date and would experience a similar rollover event 1024 weeks after that firmware creation date." Yes, exactly. It is therefore unlikely that your GPSes will become falsetickers on 6 April. That's the good news. The bad news is that they *will* go poof some unpredictable number of weeks later. -- <a href="http://www.catb.org/~esr/">Eric S. Raymond</a> My work is funded by the Internet Civil Engineering Institute: https://icei.org Please visit their site and donate: the civilization you save might be your own.