pub fn parse_timezone(input: &str) -> Result<TzOffset>Expand description
Parse a timezone string and return the offset.
Supports:
- Abbreviations: “UTC”, “PST”, “JST”, etc.
- IANA names: “Asia/Shanghai”, “America/New_York”
- Numeric offsets: “+0800”, “+08:00”, “-07:00”, “+08”, “Z”