@fav/type.to-date/lib/from-yymmdd.js

Convert a string in various date format to a date object.

'use strict';

var isString = require('@fav/type.is-string');
var isValidDate = require('@fav/type.is-valid-date');

var newDate = require('./new-date');

function fromYymmdd(text) {
  if (!isString(text)) {
    return null;
  }

  var result = /^([0-9]{2})([0-9]{2})([0-9]{2})$/.exec(text);

  if (!result) {
    return null;
  }

  var year = parseInt(result[1], 10);
  var month = parseInt(result[2], 10);
  var day = parseInt(result[3], 10);

  var currentYear = newDate().getFullYear();
  year = currentYear - (currentYear % 100) + year;
  if (year >= currentYear + 50) {
    year -= 100;
  }

  var date = newDate(year, month - 1, day);
  /* istanbul ignore if */
  if (!isValidDate(date)) {
    return null;
  }
  return date;
}

module.exports = fromYymmdd;