Moment js is not working in daylight savings and its showing the timezone as GMT instead of BST in UK

[ThilakGuna]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information if applicable):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. firefox, safari]
• Version [e.g. 22]

Moment-specific environment

• The time zone setting of the machine the code is running on
• The time and date at which the code was run
• Other libraries in use (TypeScript, Immutable.js, etc)

Please run the following code in your environment and include the output:

console.log((new Date()).toString())
console.log((new Date()).toLocaleString())
console.log((new Date()).getTimezoneOffset())
console.log(navigator.userAgent)
console.log(moment.version)

Additional context
Add any other context about the problem here.

[gilmoreorless]

See #6111 (comment)

Also, next time you raise an issue, please fill in all the details requested.