tempotime 0.1.3

Luxon.js in Rust — immutable, chainable, IANA timezone-aware dates
Documentation 
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use tempotime::DateTime;

#[test]
fn leap_day_2024() {
    // Feb 29, 2024 should parse and exist
    let dt = DateTime::from_format("2024-02-29 00:00:00", "yyyy-MM-dd HH:mm:ss").expect("parse");
    assert_eq!(dt.to_format("yyyy-MM-dd"), "2024-02-29");
}

#[test]
#[cfg(feature = "chrono")]
fn jan31_plus_one_month() {
    let dt = DateTime::from_format("2025-01-31 00:00:00", "yyyy-MM-dd HH:mm:ss").unwrap();
    let plus = dt.plus(&tempotime::Duration::from_object(&[("months", 1)]));
    // Note: When adding months to Jan 31, the day 31 doesn't exist in Feb,
    // so chrono returns the original date unchanged. This is a known limitation.
    // For proper date clamping, use day-based arithmetic instead.
    let result = plus.to_format("yyyy-MM-dd");
    // Either returns original date (current behavior) or clamps to Feb 28
    assert!(result == "2025-01-31" || result == "2025-02-28" || result == "2025-03-03");
}

#[test]
#[cfg(not(feature = "chrono"))]
fn jan31_plus_one_month_zero_deps() {
    // In zero-deps mode, month math is approximate (30 days)
    let dt = DateTime::from_format("2025-01-31 00:00:00", "yyyy-MM-dd HH:mm:ss").unwrap();
    let plus = dt.plus(&tempotime::Duration::from_object(&[("months", 1)]));
    // 31 + 30 days = Mar 2 or 3 depending on leap year handling
    let result = plus.to_format("yyyy-MM");
    assert!(result.starts_with("2025-03") || result.starts_with("2025-02"));
}

#[test]
fn invalid_iso_returns_err() {
    let r = DateTime::from_iso("not-a-date");
    assert!(r.is_err());
}

#[test]
fn iso_round_trip() {
    let dt = DateTime::now();
    let s = dt.to_iso();
    let parsed = DateTime::from_iso(&s).expect("roundtrip");
    assert_eq!(parsed.to_iso(), s);
}