Can't get a consistent result when parsing dates

[clasqui]

I'm trying to import a spreadsheet file, then convert it to json with the util XLSX.utils.sheet_to_json() to iterate through the rows.
I'm getting unexpected results when getting the value of a cell I know it's a date:

• When the file is imported as xls, the dates show as m/d/yyyy
• When the same file is imported as csv, the dates show as d/m/yyyy

In my file, using both file types, the dates show as dd/mm/yyyy and I'm using the following options when parsing the file and exporting the WB:

XLSX.utils.sheet_to_json(ws, {header:1, range: 1, dateNF: 'DD/MM/YYYY', cellText: false, raw: false});

I think this is a bug because you can get unexpected results from different inputs and there is no way to uniform it.

[SheetJSDev]

CSV dates fall back on the browser implementation of date parsing, which is unfortunately very forgiving for some browsers like Chrome

> new Date("This is not a date 1")
Mon Jan 01 2001 00:00:00 GMT-0500 (Eastern Standard Time)

The closest thing we've found to a date specification is the MS-VBAL definition of a date token.

[clasqui]

Sorry for not specifying it. My implementation is on a Node.js server, so I don't think this bug has nothing to do with the browser.