galata-vault 0.4.0

End-to-end-encrypted secrets and config documents with no accounts: the galata-vault Rust SDK. A token client and the owner API over a pluggable transport, with an optional in-process backend.
Documentation 
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//! UTC calendar fields from Unix seconds, for display. No time-zone data and
//! no dependency: Howard Hinnant's civil-from-days algorithm.

/// `(year, month, day, hour, minute, second)` in UTC.
pub fn utc(ts: i64) -> (i64, u32, u32, u32, u32, u32) {
    let days = ts.div_euclid(86_400);
    let secs = ts.rem_euclid(86_400);
    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);
    (
        y,
        m as u32,
        d as u32,
        (secs / 3600) as u32,
        ((secs % 3600) / 60) as u32,
        (secs % 60) as u32,
    )
}

/// `2025-09-10T10:26:40Z`.
pub fn rfc3339(ts: i64) -> String {
    let (y, mo, d, h, mi, s) = utc(ts);
    format!("{y:04}-{mo:02}-{d:02}T{h:02}:{mi:02}:{s:02}Z")
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn known_instants() {
        assert_eq!(rfc3339(0), "1970-01-01T00:00:00Z");
        assert_eq!(rfc3339(1_757_500_000), "2025-09-10T10:26:40Z");
        assert_eq!(rfc3339(951_782_400), "2000-02-29T00:00:00Z");
        assert_eq!(rfc3339(-1), "1969-12-31T23:59:59Z");
    }
}