refactor: use chrono for timestamp in test runner

Replace hand-rolled days_to_ymd/chrono_lite with chrono::Local::now().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -64,6 +64,15 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc7eb209b1518d6bb87b283c20095f5228ecda460da70b44f0802523dea6da04"
 
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "arboard"
 version = "3.6.1"
@@ -285,6 +294,19 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "chrono"
+version = "0.4.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c673075a2e0e5f4a1dde27ce9dee1ea4558c7ffe648f576438a20ca1d2acc4b0"
+dependencies = [
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "wasm-bindgen",
+ "windows-link",
+]
+
 [[package]]
 name = "clipboard-win"
 version = "5.4.1"
@@ -804,6 +826,30 @@ version = "3.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "62adaabb884c94955b19907d60019f4e145d091c75345379e70d1ee696f7854f"
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e31bc9ad994ba00e440a8aa5c9ef0ec67d5cb5e5cb0cc7f8b744a35b389cc470"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "icrate"
 version = "0.0.4"
@@ -1465,6 +1511,9 @@ version = "0.1.0"
 [[package]]
 name = "openwa-test-runner"
 version = "0.1.0"
+dependencies = [
+ "chrono",
+]
 
 [[package]]
 name = "openwa-wormkit"

crates/openwa-test-runner/Cargo.toml

@@ -7,3 +7,6 @@ description = "Headless replay test runner with concurrent execution"
 [[bin]]
 name = "openwa-test"
 path = "src/main.rs"
+
+[dependencies]
+chrono = "0.4"

crates/openwa-test-runner/src/main.rs

@@ -562,7 +562,7 @@ fn main() {
     });
 
     // Create run directory
-    let timestamp = chrono_lite();
+    let timestamp = timestamp();
     let run_dir = PathBuf::from(RUNS_DIR).join(&timestamp);
     let _ = fs::create_dir_all(&run_dir);
     let run_dir = strip_unc(fs::canonicalize(&run_dir).unwrap_or(run_dir));
@@ -593,38 +593,6 @@ fn main() {
     }
 }
 
-/// Simple timestamp without chrono dependency.
-fn chrono_lite() -> String {
-    use std::time::SystemTime;
-    let d = SystemTime::now()
-        .duration_since(SystemTime::UNIX_EPOCH)
-        .unwrap_or_default();
-    let secs = d.as_secs();
-    // Convert to roughly readable format (not perfect but unique)
-    let s = secs % 60;
-    let m = (secs / 60) % 60;
-    let h = (secs / 3600) % 24;
-    let days = secs / 86400;
-    // Days since epoch → approximate date
-    let (y, mo, day) = days_to_ymd(days);
-    format!("{y:04}-{mo:02}-{day:02}_{h:02}-{m:02}-{s:02}")
-}
-
-fn days_to_ymd(mut days: u64) -> (u64, u64, u64) {
-    // Rough Gregorian approximation
-    let mut y = 1970;
-    loop {
-        let ydays = if y % 4 == 0 && (y % 100 != 0 || y % 400 == 0) { 366 } else { 365 };
-        if days < ydays { break; }
-        days -= ydays;
-        y += 1;
-    }
-    let leap = y % 4 == 0 && (y % 100 != 0 || y % 400 == 0);
-    let mdays = [31, if leap { 29 } else { 28 }, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
-    let mut m = 0;
-    while m < 12 && days >= mdays[m] {
-        days -= mdays[m];
-        m += 1;
-    }
-    (y, m as u64 + 1, days + 1)
+fn timestamp() -> String {
+    chrono::Local::now().format("%Y-%m-%d_%H-%M-%S").to_string()
 }