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Re: UTC time with milliseconds
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Re: UTC time with milliseconds


  • Subject: Re: UTC time with milliseconds
  • From: Doug McNutt <email@hidden>
  • Date: Mon, 23 Feb 2015 17:03:53 -0500


On 02/23/2015 03:27 PM, Jörgen Stahle wrote:
Hi there

Does anyone know a nice way to get UTC time with milliseconds?
What I would like is a timestamp like this: 2015-02-23T20:56:31.471

It would be nice to use
*do shell script*"date -u '+%Y-%m-%dT%H:%M:%S.%N’"
- but the ”N” in that command does not work in BSD, as in other Unix
systems. It returns "2015-02-23T20:26:10.N"


Is there another way. For example by using Objective-C?

<http://www.nist.gov/pml/div688/grp40/tmas.cfm>

would be a good place to start. You're going to discover that milliseconds accuracy will require some personal hardware that synchronizes a local clock that will not be a computer.

The speed of light is about a foot per nanosecond. Absolute timing using the internet will likely never be as good as one second especially when Applescript is involved.

There has been some effort to make UNIX time words in the form of two integers. One is the usual seconds and the other is microseconds but it's useful only for local time differences as you might use for timing execution of a subroutine.

How about a random number generator to get three digits? Personally I would use perl to format whatever you want as a dot and three digits after the time value. There is a UNIX tool "time" which is a bit like data. Try a "man time" command in a shell.
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