[BUG] Claude Code is using deprecated timezones

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When quota limits are hit, Claude Code provides the reset time with timezone:
You've hit your limit · resets 1:30pm (Asia/Calcutta)

Asia/Calcutta has been deprecated following the renaming of the City.

What Should Happen?

Expected output is You've hit your limit · resets 1:30pm (Asia/Kolkata).

Error Messages/Logs

Steps to Reproduce

1. Set timezone to Asia/Kolkata.
2. Exhaust Claude code quota.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.81 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

Check and update the library being used for timezones.