MCP Time Server Node

# Timezone Validation with date-fns-tz (Updated 2025-07-18) Using `getTimezoneOffset()` - Returns NaN for invalid timezones: - `'UTC'`: valid (offset: 0ms) - `'EST'`: valid (offset: -18000000ms) - `'EST5EDT'`: valid (offset: -14400000ms) - `'Invalid/Zone'`: invalid (offset: NaN) - `'America/New_York'`: valid (offset: -14400000ms) - `'Europe/London'`: valid (offset: 3600000ms) - `'Asia/Tokyo'`: valid (offset: 32400000ms) - `'NotATimezone'`: invalid (offset: NaN) - `''`: valid (offset: 0ms - defaults to UTC) **Key Finding**: `getTimezoneOffset()` returns NaN for invalid timezones, making it suitable for validation.