d3.js尽管看似正确的格式仍无法将我的字符串解析为日期？ （V4）

Question

I am using d3js v4. The following is what my date string looks like:

var ds = "2019-02-18 22:38:18.327717";

I have set up my parser like so:

var parseDate = d3.timeParse("%Y-%m-%d %H:%M:%S.%L");

I then try and pass this string into parseDate like so:

var parsed_date_value = parseDate(ds);

But parsed_date_value is null after this. I figure there is some issue with the seconds part of my time format but it looks correct and I am not sure. Seems to me this date string matches this format im passing to d3.timeParse()

Answer 1

In your format string, you need to use microseconds ( %f ) instead of milliseconds ( %L ).

var parseDate = d3.timeParse("%Y-%m-%d %H:%M:%S.%f");

The complete reference is here: https://github.com/d3/d3-time-format#locale_format

Answer 2

as per the documentation [ https://github.com/d3/d3-time-format] :

%L - milliseconds as a decimal number [000, 999].
%f - microseconds as a decimal number [000000, 999999].

Here my L clearly was not on the range [000,999] like required by the docs. Instead it looks to be on the range [000000, 999999] so using the following fixed it:

var parseDate = d3.timeParse("%Y-%m-%d %H:%M:%S.%f");