d3.js not able to parse my string into date despite seemingly correct format? (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()

Tony Gentilcore · Accepted Answer · 2019-02-18 23:35:37Z

2

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

answered Feb 18, 2019 at 23:35

Tony Gentilcore

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sometimesiwritecode · Accepted Answer · 2019-02-18 23:32:08Z

1

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");

answered Feb 18, 2019 at 23:32

sometimesiwritecode

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