Read the statement by Michael Teeuw here.
"Invalid Date" appears in Weather module.  MM v2.29.0
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 @reilley ok, next thing weather is done all in browser, 
 on the MagicMirror screen ctrl-shift-i to
 open the developer window, select the console tab,
 put wea in the filter fieldlook for any messages 
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 @reilley - oh, I think I know what’s wrong now. 
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 @sdetweil - you’re gonna laugh, but I found the issue. I was using an inactive API key. My backup was too old and was before the v2.29.0 API 3.0 requirement. Sorry to drag you through this! 
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 @reilley glad you found it! 
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 @reilley I just realized I experienced something similar, but I was preoccupied with other tasks and didn’t take the time to investigate. Here’s a screenshot for reference: 
 https://github.com/cgillinger/MMM-WeatherEffects/blob/main/screenshots/rich.pngBased on my screenshots (as mentioned, I was focused on tweaking the module and only noticed it afterward), it seems to be intermittent. I’m using api-free providers, eg SMHI. 
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 I have the same issue. These are my settings: module: "weather", position: "top_right", config: { lat: "52.262524", lon: "6.797571", apiKey: "****", appendLocationNameToHeader: false, type: "current", degreeLabel: true, decimalSymbol: ",", showWindDirection: false, showFeelsLike: false
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 @VinGroot current release is 2.30 . still happening there ? 
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 @sdetweil yes, still happening. 
 just noticed this second page, trouble shooting now. I get a 401 unauthorized error.
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 @VinGroot well 401 means apikey not right 
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 I figured it out. I use the free plan, so I cannot use API version 3.0. I have to use API version 2.5. Furthermore I have to use the /weather endpoint. I got it working again by adding these 2 settings: apiVersion: '2.5' weatherEndpoint: "/weather"
