html-to-xlsx | node.js based html to xlsx transformation | Runtime Evironment library

I'm struggling to format date from ISO-8601 to custom numFmtId=15 cell. From my searching I found:

• OpenXml and Date format in Excel cell, What do excel xml cell attribute values mean?, What's the difference between and in Office Open XML? give me headstart on understanding excel xml.

• Microsoft docs 1 which suggest and , Microsoft docs2 explaining about numFmts (Number Formats) which I haven't found how it's supposed to works in cell format.

• https://social.msdn.microsoft.com/Forums/office/en-US/c02fc9f9-0a7d-40b5-ac16-48199df474ba/spreadsheet-format-number?forum=oxmlsdk which suggest to make two different excel with the second being what you expected and compare the .xml the only difference I found was only in styles.xml which suggest numFmtId="15"

• http://www.ericwhite.com/blog/dates-in-strict-spreadsheetml-files/

• http://officeopenxml.com/SScontentOverview.php

• Applying number formatting in OpenXML

• https://social.msdn.microsoft.com/Forums/sqlserver/en-US/9c5d65f6-46d7-4767-be3f-24862dff4a78/open-xml-spreadsheet-style-error?forum=oxmlsdk

• What indicates an Office Open XML Cell contains a Date/Time value?

I was able to detect whether or not the column header that contains date keyword and whatever column value inside, but I was unable to format it properly.

The best I was able to found on jsreport related thread was: https://jsreport.net/learn/html-to-xlsx which wasn't helping me that much since I was using xlsx recipe.

You can see playground here which contains my progress so far.

I run jsreport v1 in pretty much default settings in a server. 2 templates are called via API.

One use phantom-pdf with handler bar and one with html-to-xlsx recipe.

Before, in the older node version, both run fine. But in the current with node 10.15.0, the one with html-to-xlsx stopped working with the following logs