updated dependencies and improved time zone handling logic

[nblog]

Description

Server Details

• Server: time
• Changes to: add dependency tzlocal, fix logic to get timezone

Motivation and Context

fix #612 、#1775

How Has This Been Tested?

Breaking Changes

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation update

Checklist

• [ ] I have read the MCP Protocol Documentation
• [ ] My changes follows MCP security best practices
• [ ] I have updated the server's README accordingly
• [ ] I have tested this with an LLM client
• [ ] My code follows the repository's style guidelines
• [ ] New and existing tests pass locally
• [ ] I have added appropriate error handling
• [ ] I have documented all environment variables and configuration options

Additional context