I have that app but don't see an option to display "the offset between
NTP time and the device's internal clock." Please guide me.
Jeremy
On 3/18/2017 9:37 AM, Glen Hoag wrote:
On my iPhone, I run an NTP client, Emerald Time, that displays the offset
between NTP time and the device's internal clock.
I'm on T-Mobile US and the offset is typically in the low tens of milliseconds
or better.
It's certainly accurate enough as a clock where all I'm looking at is one
minute resolution.
Glen Hoag
h...@hiwaay.net
Sent from my iPhone
On Mar 18, 2017, at 09:52, John Hawkinson <jh...@mit.edu> wrote:
Chris Albertson <albertson.ch...@gmail.com> wrote on Fri, 17 Mar 2017
at 14:38:17 -0700 in
<CABbxVHsRa41HoB=xu4nk4t_c39uh2bcomu17nb7h3ra8uhx...@mail.gmail.com>:
AndroiTS GPS Test (V 1.48 Free) is good, but a battery hog I find. On
THIS is why the phones don't really track time so well. Not that they
can't but doing so requires battery power.
This statement doesn't seem to be well-supported. I think it's
basically untrue if we're talking about timing at the tens of
millisecond level. Anything more precise seems relatively useless in
a smartphone without specialized mechanisms to get the time off of the
phone.
A phone's GPS receiver takes a lot of battery. But GPS is not the primary
mechanism that phones use get their time.
They get time from the cellular phone network (whether from the layer
two timing information or at a higher layer with something like
NTP). The effort required to keep a phone's clock in sync, even with a
really bad local oscillator, is lost in the noise of all the other
things the phone has to do. It's just not a battery issue.
The only reason modern smartphones keep bad time is because their
designers can't be bothered to do better, or possibly the network is
providing "bad" time to the phone. (Unless I'm missing something.)
--jh...@mit.edu
John Hawkinson
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