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Power Apps - Building Power Apps
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ERROR: Expected value '' to be a valid RFC 3339 'date-time' format. Allowed ISO 8601 format(s).....

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I'm new to Power Apps and I'm trying to solve a problem reading the date from an Excel sheet connected to my app.
the data format of the column is "dd/mm/yyyy" and using a date picker I can write it correctly in the Excel record. 
Unfortunately I can't read it from the file afterwards.
Setting ThisItem.DATA (where date is my Excel column) returns an error like:
The expected value "45512.9166666667" must be a valid RFC 3339 "date/time" format. Allowed ISO 8601 formats: 'YYYY-MM-DDThh:mm:ssZl, 'YYYY-MM-DDThh:mm:ss±hh:mm l , 'YYYY-MMDDThh:mm:ssl.
I couldn't find any solution suggestions for this.
Could you give me advice to resolve this error?
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