Fix date formatting overflow bug

- Use chrono library for proper date parsing from Unix timestamps
- Fixes integer overflow in manual date calculation that caused
  dates to display as huge numbers like "2026-01-18446744073709551241"

Cargo.toml

@@ -13,6 +13,7 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 toml = "0.8"
 dirs = "5.0"
+chrono = "0.4"
 
 [profile.release]
 lto = true

src/ui.rs

@@ -490,29 +490,9 @@ fn create_size_bar(size: u64, max_size: u64) -> String {
 fn format_date(timestamp: &str) -> String {
     // ZFS returns timestamp as Unix epoch seconds
     if let Ok(ts) = timestamp.parse::<i64>() {
-        use std::time::{UNIX_EPOCH, Duration};
-        if let Some(datetime) = UNIX_EPOCH.checked_add(Duration::from_secs(ts as u64)) {
-            // Format as YYYY-MM-DD
-            let secs = datetime.duration_since(UNIX_EPOCH).unwrap().as_secs();
-            let days = secs / 86400;
-            let years_since_1970 = days / 365;
-            let year = 1970 + years_since_1970;
-
-            // Simplified date calculation
-            let remaining_days = days - (years_since_1970 * 365) - (years_since_1970 / 4);
-            let month_days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
-            let mut month = 1;
-            let mut day = remaining_days;
-
-            for (i, &m_days) in month_days.iter().enumerate() {
-                if day < m_days as u64 {
-                    month = i + 1;
-                    break;
-                }
-                day -= m_days as u64;
-            }
-
-            return format!("{:04}-{:02}-{:02}", year, month, day + 1);
+        use chrono::{DateTime, Utc};
+        if let Some(dt) = DateTime::<Utc>::from_timestamp(ts, 0) {
+            return dt.format("%Y-%m-%d").to_string();
         }
     }
     // Return original if parsing fails