d3.timeFormatLocale(definition)
Returns a locale object for the specified definition with locale.format, locale.parse, locale.utcFormat, locale.utcParse methods. The definition must include the following properties:
dateTime - the date and time (%c) format specifier (e.g., "%a %b %e %X %Y").
date - the date (%x) format specifier (e.g., "%m/%d/%Y").
time - the time (%X) format specifier (e.g., "%H:%M:%S").
periods - the A.M. and P.M. equivalents (e.g., ["AM", "PM"]).
days - the full names