keepLocalTime does NOT work correctly at DST

[kawanet]

Describe the bug

keepLocalTime flag does NOT work correctly at .tz("America/Los_Angeles", true). See No.5 below.
Note that, in LA, March 13 was the day to switch from STD to DST at 2022.

const dayjs = require("dayjs");
dayjs.extend(require("dayjs/plugin/utc"));
dayjs.extend(require("dayjs/plugin/timezone"));

// #1 - OK
dayjs("2022-03-13T01:59:59Z").utc().format();
// => '2022-03-13T01:59:59Z'

// #2 - OK
dayjs("2022-03-13T01:59:59Z").utc().tz("America/Los_Angeles", true).format();
// => '2022-03-13T01:59:59-08:00'

// #3 - OK
dayjs("2022-03-13T01:59:59Z").utc().tz("America/Los_Angeles", true).tz("America/Los_Angeles").format();
// => '2022-03-13T01:59:59-08:00'

// #4 - OK. It's 3 o'clock.
dayjs("2022-03-13T03:00:01Z").utc().format();
// => '2022-03-13T03:00:01Z'

// #5 - NG. It's 4 o'clock NOT 3. keepLocalTime does not work. Incorrect time zone offset.
dayjs("2022-03-13T03:00:01Z").utc().tz("America/Los_Angeles", true).format();
// actual => '2022-03-13T04:00:01-08:00' 
// expected => '2022-03-13T03:00:01-07:00'

// #6 - NG. It's 5 o'clock. Time zone offset is correct.
dayjs("2022-03-13T03:00:01Z").utc().tz("America/Los_Angeles", true).tz("America/Los_Angeles").format();
// actual => '2022-03-13T05:00:01-07:00'
// expected => '2022-03-13T03:00:01-07:00'

Expected behavior

keepLocalTime should work. Correct time zone offset -07:00.

dayjs("2022-03-13T03:00:01Z").utc().tz("America/Los_Angeles", true).format();
// => '2022-03-13T03:00:01-07:00'

dayjs("2022-03-13T03:00:01Z").utc().tz("America/Los_Angeles", true).tz("America/Los_Angeles").format();
// => '2022-03-13T03:00:01-07:00'

Information

• Day.js Version: 1.11.7
• OS: macOS
• Browser: node v18
• Time zone: America/Los_Angeles and any other DST switching areas.

[kawanet]

The issue is NOT fixed yet at fix/issue2037 branch commit 231ff0f on pr #2118

FYI: Now we have yet another alternative library cdate which returns the correct results as below:
https://www.npmjs.com/package/cdate

const dayjs = require("cdate").cdate; // API COMPATIBLE

dayjs("2022-03-13T01:59:59Z").utc().format();
// => '2022-03-13T01:59:59+00:00'

dayjs("2022-03-13T01:59:59Z").utc().tz("America/Los_Angeles", true).format();
// => '2022-03-13T01:59:59-08:00'

dayjs("2022-03-13T01:59:59Z").utc().tz("America/Los_Angeles", true).tz("America/Los_Angeles").format();
// => '2022-03-13T01:59:59-08:00'

dayjs("2022-03-13T03:00:01Z").utc().format();
// => '2022-03-13T03:00:01+00:00'

dayjs("2022-03-13T03:00:01Z").utc().tz("America/Los_Angeles", true).format();
// => '2022-03-13T03:00:01-07:00'

dayjs("2022-03-13T03:00:01Z").utc().tz("America/Los_Angeles", true).tz("America/Los_Angeles").format();
// => '2022-03-13T03:00:01-07:00'