date-fns/parse/_lib/parsers/FractionOfSecondParser.js

Modern JavaScript date utility library

import { Parser } from "../Parser.js";

import { mapValue, parseNDigits } from "../utils.js";

export class FractionOfSecondParser extends Parser {
  priority = 30;

  parse(dateString, token) {
    const valueCallback = (value) =>
      Math.trunc(value * Math.pow(10, -token.length + 3));
    return mapValue(parseNDigits(token.length, dateString), valueCallback);
  }

  set(date, _flags, value) {
    date.setMilliseconds(value);
    return date;
  }

  incompatibleTokens = ["t", "T"];
}