How to set time automatically at power up?

[Chris Green]

I run a headless BBB on my boat. I need it to have the right time so
that information it sends is correctly time stamped.

How can I get it to power up with the right time and date? I have
installed ntp/ntpd to keep the time correct once up and running but it
doesn't initialise the time and date. What's the way to do this?

--
Chris Green
·

[Robert Nelson]

Debian Wheezy or Jessie?

In wheezy, setup a job to run at startup, check for connection and
just run "ntpdate pool.ntp.org"

In Jessie, there's a systemd

sudo systemctl enable systemd-timesyncd.service || true

both cases rely on a active internet connection...

Regards,

--
Robert Nelson
https://rcn-ee.com/

[Chris Green]

Robert Nelson <robert...@gmail.com> wrote:
> On Thu, Dec 15, 2016 at 10:14 AM, Chris Green <c...@isbd.net> wrote:
> > I run a headless BBB on my boat. I need it to have the right time so
> > that information it sends is correctly time stamped.
> >
> > How can I get it to power up with the right time and date? I have
> > installed ntp/ntpd to keep the time correct once up and running but it
> > doesn't initialise the time and date. What's the way to do this?
>
> Debian Wheezy or Jessie?
>

It's Wheezy.

> In wheezy, setup a job to run at startup, check for connection and
> just run "ntpdate pool.ntp.org"
>

OK, thanks, that seems straightforward.

> In Jessie, there's a systemd
>
> sudo systemctl enable systemd-timesyncd.service || true
>
> both cases rely on a active internet connection...
>

Of course, yes. If the internet isn't reliable is it worth running
'ntpdate' at intervals using cron so that if there isn't a connection
at startup it will get set when the internet does appear?

--
Chris Green
·

[Robert Nelson]

In that case, something like this would just work better:

https://www.sparkfun.com/products/12708

You can find them cheaper elsewhere..

[William Hermans]

There's also a software package known as fake hwclock. It's not a real time clock, and perhaps it'll even lose time over long periods. But it seems to do a reasonable job of keeping time on a system close.

We actually use  DS3232 on those devices that *need* to keep accurate time.

--
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[Chris Green]

OK, thanks again, that might be my next add-on for the BBB.

--
Chris Green
·