Year support for "10000"

[I563099]

In the file-"d3.js", Method-"format.parse" and line-if (i != string.length) return null;
Year is supported only till "9999"(string.length=14) if year "10000" is passed then it is returning as null because length will be increased by 1(string.length=15).
Is it a technical restriction or is there any other way forward to handle such scenarios ?

[mbostock]

The %Y specifier is defined as a four-digit year so that you can do things like %Y%m%d and parse digits with no separator.

d3.utcParse("%Y%m%d")("20200101") // 2020-01-01T00:00:00.000Z

If we want to parse variable-digit years then we would need a different specifier.

[I563099]

The version of D3 we are using is - D3 v3.4.12 - http://d3js.org/

Sample example: https://jsbin.com/rubufenida/edit?html,js,console,output

Is there any specifier which we can use for year "10000" as specified in above sample? Because we didn't find any in - https://observablehq.com/@bumbeishvili/d3-timeformat-playground

If not what is the alternative which we can use.
Please let us know.