number of digits in %L

[braunmpifkf]

A timestamp created by Python datetime.datetime.today().isoformat() outputs 2017-11-21T08:34:28.150206. When reading this in from file and parsing it with d3.utcParse("%Y-%m-%dT%H:%M:%S.%L"), I get an error since the fractional seconds part has six instead of three digits. Without knowing what the ISO standard really specifies there, it were nice if %L could either be more lenient and accept any number of consecutive digits, or the number of digits could be specified. This would save the effort of having to truncate/reformat the string before parsing it and would allow direct export/import of ISO datetime data.

[mbostock]

You can use %f to parse microseconds, though note that JavaScript dates only have millisecond resolution so this loses information. This feature was added in d3-time-format 2.1.0 (d3 4.12.0).

[mbostock]

Also, if you don’t mind relying on relatively recent browsers, you can use d3.isoParse to parse these strings instead (or simply use the Date constructor). You will need to add the trailing Z for UTC.

d3.isoParse("2017-11-21T08:34:28.150206Z") // Tue Nov 21 2017 03:34:28 GMT-0500 (EST)
new Date("2017-11-21T08:34:28.150206Z") // Tue Nov 21 2017 03:34:28 GMT-0500 (EST)