[time-nuts] When does NIST change to DST?

Bill Byrom time at radio.sent.com
Sun Mar 13 17:29:08 EDT 2016


The NIST web page at http://nist.time.gov is rather complex. It appears to use the discontinued OpenLaszlo[1] programming techniques. As far as I can tell, the determination of the time zone and Earth image are all done using javascript in your browser. So the solution of your issue is probably going to be closing your browser and re-opening at NIST page. If that fails, you may need to clear your browser cache.
 
The web page uses a bit of javascript in the HTML page itself, with an additional long javascript library file which is downloaded to your browser. If you are using Firefox, see the HTML code at:
view-source:http://nist.time.gov/
 
With any browser, see the javascript library code at:
http://nist.time.gov/nist_time.lzx.js
 
Your browser reveals the timezone you are in to the javascript code
running in your browser, and this local code determines the daylight
saving time status and timezone.
 
In addition, the javascript code running in your browser actually solves Kepler's equation to get the ecliptic latitude and longitude, then converts this to equatorial latitude and longitude. These values are used to select a xearth image[2] from a NIST server. The image shows the illumination of the Earth at various points in the Earth's orbit and rotation (time). For example:
http://www.time.gov/images/xearths/1S/96S.jpg
http://www.time.gov/images/xearths/23N/180N.jpg
 
 --
Bill Byrom N5BB
 
 
 
On Sun, Mar 13, 2016, at 01:50 PM, James Flynn wrote:
> <jmfranke at ...> writes:
>
>>
>> I noticed that NIST, at http://nist.time.gov/, is still sending 
> standard time. When do they change?
>>
>> John  WA4WDL
>>
>>
>
> As of 1849Z it was reporting DST.
>
>
> _________________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
 

Links:

  1. https://en.wikipedia.org/wiki/OpenLaszlo
  2. http://xearth.org/


More information about the time-nuts mailing list