Wrongly parsing csv string cell as date

When reading a CSV string, some fields that should be parsed as strings are parsed as dates.

This happens when the string ends with something that resembles a date.

Use the following snippet to reproduce.

var foo = 'foo,bar\nfoo2,bar2\n"Wololo thing - ends Feb. 15, 2017","Wololo thing - ends Feb. 15, 2017 bar"';
var w = XLSX.read(foo, {type: "string", cellDates: true});
console.log(w.Sheets.Sheet1);

Expected result: the third row contains 2 strings:

{t: "s", v: "Wololo thing - ends Feb. 15, 2017"}
{t: "s", v: "Wololo thing - ends Feb. 15, 2017 bar"}

Actual result: the third row contains

{t: "d", v: Wed Feb 15 2017 00:00:00 GMT-0200 (-02), w: "2/15/17"}
{t: "s", v: "Wololo thing - ends Feb. 15, 2017 bar"}

[speedofsound99]

I’m using xlsx.read(foo, { type: ‘string’, raw:true }); and I’m getting the dates in the expected plain text format

[mcdado]

For example, the string Today is Jan 25 2018 can be reproduced by setting a cell to 43125 with format "Today is "mmm dd yyyy. Should the string be considered a date or a string?

This seems crazy to me! Keep it as a string of course!!!

This behavior should be disabled on request. I’m importing a CSV (tried with xls too) to perform corrections and it keeps on converting values like “VIA MARTUCCI 2” to the date “3/2/01”, I tried using raw: true but it simply uses the number “36952”. Only with xlsx files it doesn’t convert these values.