Locales can't be used in parsing dates

Update: This was originally a bug about missing documentation about using locales without babel.

Describe the bug I was under the assumption that locales would help in parsing dates.

I tried

const dayjs = require('dayjs');
const enGB = require('dayjs/locale/en-gb');

const dateStringUS = "09/10/2019, 08:51";
const dateStringGB = "11/09/2019, 08:50";

var dateUS = dayjs(dateStringUS).toDate();
dayjs.locale(enGB);
var dateGB = dayjs(dateStringGB).toDate();

console.log("dateUS: " + dateUS);
console.log("dateGB: " + dateGB);

and I get

dateUS: Tue Sep 10 2019 08:51:00 GMT+0200 (GMT+02:00)
dateGB: Sat Nov 09 2019 08:50:00 GMT+0100 (GMT+01:00)

Expected behavior I was expecting an output like

dateUS: Tue Sep 10 2019 08:51:00 GMT...
dateGB: Wed Sep 11 2019 08:50:00 GMT...

Using dayjs(datestring, { locale: enGB }); yielded the same result.

Information

• Day.js Version v1.8.16
• OS: Windows 10
• Browser node.js v10.15.3
• Time zone: n/a

[raketenolli]

Thanks, so a solution to my issue would be

var L = dayjs.Ls[dayjs.locale()].formats.L;
var LT = dayjs.Ls[dayjs.locale()].formats.LT;
var dateParsedUsingCurrentLocale = dayjs(dateString, `${L}, ${LT}`);
console.log(dateParsedUsingCurrentLocale.format("LLLL"));

[iamkun]

Here’s working around to get the locale formats https://github.com/iamkun/dayjs/issues/680