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Your LimeSurvey version: 6.2.9
Own server hosting
Survey theme/template: fruity twenty three. 
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I have a survey in French and English. I’m using the drop down for the date picker. When I enter the date and then if I change to the other language, I get the error.
” could not convert date 01-01-2010 to format d/m/Y. Please check your date format settings.” 
The date format is default. I have no settings that I have entered into the input field. I am wondering if this is a design error or planned. I don’t want to put in a bug report if it’s the way it’s supposed to work.
Thanks