Ah, I see your gapsize is still in milliseconds. That tells me you haven't 
upgraded to the latest version of the skin, or you've skipped upgrading 
belchertown.py. 

Keep your graphs.conf the same, and upgrade all files to the latest version 
of all files. You'll notice in the development release notes 
<https://github.com/poblabs/weewx-belchertown/blob/development/changelog>the 
breaking change of gapsize is now in seconds (300) , not milliseconds 
(300000)

On Sunday, August 2, 2020 at 6:35:10 AM UTC-4 [email protected] wrote:

> Hi,
>
> i try to create a chart with time-lenght=day_ago_to_now or hour_ago_to_now 
> according to the documentation.
> I do not succeed.
>
> WeeWX version: 4.1.1  Belchertown Skin Version: 1.2rc1 
>
> /var/log/weewx.log
>
> weewx.cheetahgenerator: Generated 11 files for report Belchertown in 0.82 
> seconds
> weewx.reportengine: Copied 3 files to /var/www/html/public_html
> weewx.reportengine: Caught unrecoverable exception in generator 
> 'user.belchertown.HighchartsJsonGenerator'
> weewx.reportengine:         ****  invalid literal for int() with base 10: 
> 'day_ago_to_now'
> weewx.reportengine:         ****  Traceback (most recent call last):
> weewx.reportengine:         ****    File 
> "/usr/share/weewx/weewx/reportengine.py", line 197, in run
> weewx.reportengine:         ****      obj.start()
> weewx.reportengine:         ****    File 
> "/usr/share/weewx/weewx/reportengine.py", line 280, in start
> weewx.reportengine:         ****      self.run()
> weewx.reportengine:         ****    File 
> "/usr/share/weewx/user/belchertown.py", line 1507, in run
> weewx.reportengine:         ****      time_length = int(time_length) # 
> Convert to int() for minstamp math and for point_timestamp conditional later
> weewx.reportengine:         ****  ValueError: invalid literal for int() 
> with base 10: 'day_ago_to_now'
> weewx.reportengine:         ****  Generator terminated
>
> --------------------------
> graphs.conf
>
> aggregate_type = None
> time_length = 90000 # Last 25 hours
> type = line
> tooltip_date_format = "LLL"
>
> [homepage]
>     # Chart Timespan Defaults
>     title = "Homepage"
>     show_button = true
>     button_text = "Homepage"
> #    time_length = today
>     tooltip_date_format = "LLL"
>     gapsize = 300000
>
>     [[chart1]]
>         title = Temperature
>         time_length = day_ago_to_now
>         time_ago = 1
>         start_at_midnight = true      
>         [[[outTemp]]]
>             zIndex = 1
>             name = Temperature
>
>
> Joachim
>
>

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