Re: Time ticks on a computer

From: Paul Salanitri (
Date: Sun Nov 13 2011 - 21:39:07 UTC

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    On the iPhone I use Emerald Timestamp which not only corrects using NTP, it will give you a synced status (yellow or green) and allows you to time stamp even before sync, which will show the  corrected time once it syncs in. Typical time to UTC delta is about 0.05s or less. 
    If you're like me, you'll love it. 
    (phone company network time is useless - it can be close then jump to be 30 seconds off)
    Paul S
    On 14/11/2011, at 6:08, Gavin Eadie <> wrote:
    > On Nov 11, 2011, at 1:25 AM, wrote:
    >> By the way, even without an app, the system time on Android phones is reliably between 13 and 15 seconds ahead of UTC (select Accra, Ghana for a city that's always on UTC if you don't find UTC as a direct option).
    > [slightly OT] ... I wrote an ISS tracking program for iPhone a couple of years ago and discovered my phone to be up to two minutes off true time (I went as far as writing a network time client into my prediction software to get better time!).  Apparently, 'cellular phone time' commonly deviated by large amounts.  More recently, iPhone time is much more closer to true -- I don't know if the phone company is doing a better job or the iPhone is using network time instead.
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