d3-time-format is a JavaScript module used to parse or format dates in various locale-specific representations.
The module is inspired by the
strptimeandstrftimefunctions from the C standard library.
The module provides a formatter and a parser:
formatter is used to format a JavaScript date object into a string representation
parser converts a string back to a date object
If you’re using NPM:
npm install d3-time-format
Otherwise, download the latest release. You can also load directly from d3js.org, either as a standalone library or as a part of D3.
To format a date, create a formatter from a date to the formatter (which returns a string). For instance, to convert the current date to a human-readable string:
let formatTime = d3.timeFormat("%B %d, %Y");formatTime(new Date); // "January 15, 2020"
To create a parser to convert a string back to a date:
let parseTime = d3.timeParse("%B %d, %Y");parseTime("January 15, 2020"); // Tue Jun 30 2015 00:00:00 GMT-0700 (PDT)
More elaborate conditional time formats can be implemented as well. For instance, a multi-scale time format that uses time intervals.
As an example, let’s convert today’s date from a date object into a string and then convert it back into a date object:
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