localDatetime timezone discrepancy in iso8601 format

Summary

There is no difference in output between datetime and localDatetime in iso8601 format. I would expect the local timezone to be taken into account for localDateTime.

Replication Steps

Using PostBin as a free API client to test requests using this script:

POST https://postb.in/###?
  &iso8601_datetime={{$datetime iso8601}}
  &iso8601_localDatetime={{$localDatetime iso8601}}
  &rfc1123_datetime={{$datetime rfc1123}}
  &rfc1123_localDatetime={{$localDatetime rfc1123}}

Expected Behavior

In the UK, which is currently observing UTC +1 timezone.

Variable	Format	Result
$datetime	iso8601	2020-07-28T14:30:00.000Z
$localDatetime	iso8601	2020-07-28T15:30:00.000+01:00

Actual Behavior

In the UK, which is currently observing UTC +1 timezone.

Variable	Format	Result
$datetime	iso8601	2020-07-28T14:30:00.000Z
$localDatetime	iso8601	2020-07-28T14:30:00.000Z

For comparison, this difference is reflected correctly in rfc1123 format.

Variable	Format	Result
$datetime	rfc1123	Tue, 28 Jul 2020 14:30:00 GMT
$localDatetime	rfc1123	Tue, 28 Jul 2020 15:30:00 0100

Thanks for your time and effort for this extension and wish you the best with development on #628!

Version

REST Client	VS Code	OS
v0.24.1	v1.47.3	Windows 10 v2004

[Huachao]

@rdhar nice catch, I have fixed it, and before I publish a new version, you can try the format like following to achieve this {{$localDatetime 'YYYY-MM-DDTHH:mm:ss.SSSZ'}} with a specified format string.

[Huachao]

@rdhar I will use your suggestion, however, the format YYYY-MM-DDTHH:mm:ss.SSSZ works on my machine