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Re: Getting the Date and Time From a Time Server

• To: mathgroup at smc.vnet.net
• Subject: [mg120926] Re: Getting the Date and Time From a Time Server
• From: Gregory Lypny <gregory.lypny at videotron.ca>
• Date: Tue, 16 Aug 2011 01:27:30 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201108131047.GAA25453@smc.vnet.net>

Good stuff.  Thank you, Hans.  Tracking cell history looks like it will have many uses in my projects!

Regards,

Gregory



On Mon, Aug 15, 2011, at 12:00 AM, Hans Michel wrote:

> CellPrint[
> Cell[Import["http://tycho.usno.navy.mil/cgi-bin/timer.pl";], "Text", 
>  CellTags -> "TimeStamp", Editable -> False, 
>  TrackCellChangeTimes -> True, ShowCellBracket -> False, 
>  CellOpen -> True, Deletable -> False, Copyable -> False, 
>  Selectable -> False, Deployed -> True]]
> 
> For the purposed of demonstration CellOpen -> True but if you intend to use
> this you would want to set this option to CellOpen -> False. You may want to
> hide the output from the student. 
> 
> Apparently you need the timestamp when a student claims they have finished a
> project. This way you don't track every action. You just want to be fair and
> make certain that everyone has made the deadline.
> 
> If notebook history is turned on then using the "Cell > Notebook History
> ..." may also help.
> 
> Also see if
> 
> "Prefences > Internet Connectivity > Proxy Settings > Direct Connection to
> the Internet" works for other solutions offered. It may be the proxy setting
> blocking you ports.
> 
> The following URL were usable from my browser, most were not usable in the
> Import function 
> http://www.atomictime.net:1313/
> http://www.atomictime.net/time_tel.html?2
> http://www.atomictime.net/time_tel.html?4
> http://tycho.usno.navy.mil/cgi-bin/timer.pl * (Usable with Import)
> http://tycho.usno.navy.mil/cgi-bin/anim
> http://nist.time.gov:8013/
> This port return number of milliseconds since {1970,1,1,0,0,0}
> 
> Hans
> 
> -----Original Message-----
> From: Gregory Lypny [mailto:gregory.lypny at videotron.ca] 
> Sent: Sunday, August 14, 2011 7:21 PM
> To: mathgroup at smc.vnet.net
> Subject: Re: Getting the Date and Time From a Time Server
> 
> Thanks Bobby,
> 
> Yes, most computers are connected and do keep time in between syncs.  But it
> is easy for a student, who was supposed to submit something by a deadline
> but is late, to reset their clock and calendar, and create a file that is
> backdated to before the deadline.  If my submission system works on the
> client side, with Mathematica putting a date- and time-stamp in the file at
> their machine, it is a problem.  Of course, when the file arrives at my
> machine, it will be given a creation date and time according to my systems
> settings, which will be correct, or at least consistent across submissions,
> as long as I am in sync.  I just thought it would be nice to have the stamp
> right in the file (client), but it is certainly no problem for me to loop
> through the submissions on my side to make sure that the dates and times
> make sense.
> 
> I just wanted to experiment with both.
> 
> Regards,
> 
> Gregory
> 
> 
> 
> On Sat, Aug 13, 2011, at 1:48 PM, DrMajorBob wrote:
> 
>> My computer is almost always connected to the Internet, and it keeps time
> (like any clock) between synchs.
>> 
>> I doubt that retrieving time from the Internet can be more accurate, given
> the communication latencies involved.
>> 
>> Do you think Import from a URL is instantaneous?
>> 
>> Bobby
> 
> 

• References:
  • Getting the Date and Time From a Time Server
    • From: Gregory Lypny <gregory.lypny@videotron.ca>