I tried to find this, but I can’t find any date string that would look like that that I haven’t already changed. 
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It was apparently just a cache issue, my mobile had not updated its JavaScript files and everything, yet. 
Now it’s grreat.
Thanks very much @Freso. I hope it’s better for most of us.
As a USAian, one thing I like about the ISO 8601 format is that in casual communication one can drop the year and it turns into a US style date
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But then it becomes ambiguously counter-Latin and you will only be understood in USA, again. 
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