fix: support timezone offsets that exceed 24-hour range #774

Job	Run time
cargo test (ubuntu-latest)	23s
cargo test (macOS-latest)	22s
cargo check (ubuntu-latest)	14s
cargo test (windows-latest)	1m 18s
cargo check (windows-latest)	44s
cargo fmt --all -- --check	6s
cargo check (macOS-latest)	11s
Minimum Supported Rust Version (windows-latest)	58s
cargo clippy -- -D warnings (ubuntu-latest)	20s
cargo clippy -- -D warnings (windows-latest)	1m 31s
Minimum Supported Rust Version (ubuntu-latest)	28s
Code Coverage (ubuntu-latest, unix)	1m 37s
cargo clippy -- -D warnings (macOS-latest)	27s
Minimum Supported Rust Version (macOS-latest)	34s
Code Coverage (macos-latest, macos)	1m 57s
Code Coverage (windows-latest, windows)	3m 20s
Run the fuzzers	2m 16s
	16m 46s

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