I gave a link to the file so you could look at it:
https://github.com/poblabs/weewx-belchertown/blob/master/skins/Belchertown/js/belchertown.js.tmpl

There is a definition of a "var d" at line 507.
var d = new Date();

I still can't tell where it's getting its time from.

On Sat, Mar 26, 2022 at 6:37 PM Doug Jenkins <[email protected]> wrote:

> I think it is from the local client. The JavaScript is executed in the
> browser.
>
> We need to see where "D" is initialized to make sure it is not using a web
> api to obtain the time
>
> On Sat, Mar 26, 2022, 4:39 PM Eric K <[email protected]> wrote:
>
>> I have the Belchertown skin theme set to "auto" so it switches over to
>> the dark theme around sunset.
>> I have noted that the Belchertown skin switches over to the dark theme at
>> large fractions of an hour before sunset actually occurs.
>> Then, I got a report from a friend in the Eastern time zone, that the
>> webpage theme switched to dark around 6:00pm Eastern time - around 2 hours
>> early compared to the local sundown time (7:39pm Central) at my weewx
>> weather station.
>> He said he had not clicked the manual theme switch at the upper right
>> corner of the Belchertown page.
>>
>> So, I started looking through the code to see how the theme change gets
>> triggered.
>>
>> see:
>> https://github.com/poblabs/weewx-belchertown/blob/master/skins/Belchertown/js/belchertown.js.tmpl
>>
>> Around line 507 the current hour and minute get assigned to variables
>> with the expressions
>> var nowHour = d.getHours();
>> var nowMinutes = d.getMinutes();
>> Where is the time being read from?
>> 1. from the clock of the computer that weewx is running inside?
>> 2. from the clock of webpage visitor's computer?
>>
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