utc-offset 0.4.0

When you absolutely NEED the UTC offset
Documentation 
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use once_cell::sync::Lazy;
use regex::Regex;

use crate::{get_local_timestamp_rfc3339, offset_from_process, try_set_global_offset_from_pair};

static TIME_FORMAT_REGEX: Lazy<Regex> = Lazy::new(|| {
    Regex::new("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}[+|-]\\d{2}:\\d{2}").unwrap()
});

macro_rules! test_is_ok {
    ($offset_hr:expr, $offset_min:expr, $exp_ts_offset:expr) => {
        let pair_res = try_set_global_offset_from_pair($offset_hr, $offset_min);
        assert!(pair_res.is_ok(), "pair_res: {pair_res:?}");
        let res = get_local_timestamp_rfc3339();
        assert!(res.is_ok(), "res: {:#?}", res);
        let res = res.unwrap().0;
        assert!(!res.is_empty(), "res: {:#?}", res);
        assert!(TIME_FORMAT_REGEX.is_match(&res), "res: {:#?}", res);
        assert!(res.contains($exp_ts_offset), "res: {:#?}", res);
    };
}

#[test]
fn offset_tests() {
    test_is_ok!(-8, 0, "-08:00");
    test_is_ok!(6, 0, "+06:00");
    test_is_ok!(0, 0, "+00:00");
    assert!(try_set_global_offset_from_pair(127, 0).is_err());
    assert!(try_set_global_offset_from_pair(-127, 0).is_err());
    assert!(try_set_global_offset_from_pair(0, -1).is_err());
    assert!(try_set_global_offset_from_pair(0, 60).is_err());
}

#[test]
fn get_offset_from_proc_test() {
    let res = offset_from_process();
    assert!(res.is_ok());
}