rs-suno 0.34.0

A download-only command-line tool for mirroring your Suno.ai library.
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//! Wall-clock reads: the current Unix time and its RFC 3339 rendering.
//!
//! Isolated so the rest of the CLI takes a single, shared view of "now" for
//! selection windows, the last-run marker, and the lineage graph's
//! `first_seen_at`/`last_seen_at` stamps.

pub(crate) fn now_secs() -> u64 {
    std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .map(|d| d.as_secs())
        .unwrap_or(0)
}

/// The current UTC instant as an RFC 3339 timestamp (`YYYY-MM-DDThh:mm:ssZ`),
/// used to stamp `first_seen_at`/`last_seen_at` on graph nodes and edges.
pub(crate) fn now_rfc3339() -> String {
    rfc3339_from_unix(now_secs())
}

/// Format Unix seconds as an RFC 3339 UTC timestamp via Howard Hinnant's
/// civil-from-days algorithm, avoiding a date-library dependency for a single
/// audit stamp.
fn rfc3339_from_unix(secs: u64) -> String {
    let days = (secs / 86_400) as i64;
    let tod = (secs % 86_400) as i64;
    let (hour, minute, second) = (tod / 3_600, (tod % 3_600) / 60, tod % 60);

    let z = days + 719_468;
    let era = if z >= 0 { z } else { z - 146_096 } / 146_097;
    let doe = z - era * 146_097;
    let yoe = (doe - doe / 1_460 + doe / 36_524 - doe / 146_096) / 365;
    let year = yoe + era * 400;
    let doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
    let mp = (5 * doy + 2) / 153;
    let day = doy - (153 * mp + 2) / 5 + 1;
    let month = if mp < 10 { mp + 3 } else { mp - 9 };
    let year = if month <= 2 { year + 1 } else { year };

    format!("{year:04}-{month:02}-{day:02}T{hour:02}:{minute:02}:{second:02}Z")
}