loadmaster-probe 0.3.0

loadmaster: Tool-call and structured-output conformance probe, eval runner
Documentation 
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//! UTC timestamps for the write boundary (SQLite rows, lockfile verdicts). Nothing else in
//! the probe reads the clock.

use std::time::{SystemTime, UNIX_EPOCH};

/// `YYYY-MM-DDTHH:MM:SSZ` for a Unix time.
pub fn rfc3339(unix_secs: u64) -> String {
    let days = (unix_secs / 86_400) as i64;
    let secs = unix_secs % 86_400;
    // Civil date from days since 1970-01-01 (H. Hinnant, "chrono-Compatible Low-Level Date
    // Algorithms").
    let z = days + 719_468;
    let era = z.div_euclid(146_097);
    let doe = z.rem_euclid(146_097);
    let yoe = (doe - doe / 1460 + doe / 36_524 - doe / 146_096) / 365;
    let doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
    let mp = (5 * doy + 2) / 153;
    let d = doy - (153 * mp + 2) / 5 + 1;
    let m = if mp < 10 { mp + 3 } else { mp - 9 };
    let y = yoe + era * 400 + i64::from(m <= 2);
    format!(
        "{y:04}-{m:02}-{d:02}T{:02}:{:02}:{:02}Z",
        secs / 3600,
        secs / 60 % 60,
        secs % 60
    )
}

pub fn now() -> String {
    rfc3339(
        SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .map_or(0, |d| d.as_secs()),
    )
}

#[cfg(test)]
mod tests {
    #[test]
    fn known_dates() {
        assert_eq!(super::rfc3339(0), "1970-01-01T00:00:00Z");
        assert_eq!(super::rfc3339(951_782_400), "2000-02-29T00:00:00Z");
        assert_eq!(super::rfc3339(1_792_281_600), "2026-10-18T00:00:00Z");
    }
}