feat(ios): parse the archive plist's CreationDate field

src/launchpad/api/update_api_models.py

@@ -47,7 +47,7 @@ class AppleAppInfo(BaseModel):
     profile_expiration_date: Optional[str] = None
     certificate_expiration_date: Optional[str] = None
     missing_dsym_binaries: Optional[List[str]] = None
-    # TODO(EME-423): add "date_built" field once exposed in 'AppleAppInfo'
+    build_date: Optional[str] = None
 
 
 class AndroidAppInfo(BaseModel):

src/launchpad/artifact_processor.py

@@ -464,7 +464,6 @@ def _get_artifact_type(artifact: Artifact) -> ArtifactType:
 
         apple_app_info = None
         if isinstance(app_info, AppleAppInfo):
-            # TODO(EME-423): add "date_built" field once exposed in 'AppleAppInfo'
             apple_app_info = AppleAppInfoModel(
                 is_simulator=app_info.is_simulator,
                 codesigning_type=app_info.codesigning_type,
@@ -475,6 +474,7 @@ def _get_artifact_type(artifact: Artifact) -> ArtifactType:
                 profile_expiration_date=app_info.profile_expiration_date,
                 certificate_expiration_date=app_info.certificate_expiration_date,
                 missing_dsym_binaries=app_info.missing_dsym_binaries,
+                build_date=app_info.build_date,
             )
 
         android_app_info = None

src/launchpad/artifacts/apple/zipped_xcarchive.py

@@ -66,6 +66,7 @@ def __init__(self, path: Path) -> None:
         self._extract_dir = self._zip_provider.extract_to_temp_directory()
         self._app_bundle_path: Path | None = None
         self._plist: dict[str, Any] | None = None
+        self._archive_plist: dict[str, Any] | None = None
         self._provisioning_profile: dict[str, Any] | None = None
         self._dsym_info: dict[str, DsymInfo] | None = None
 
@@ -89,6 +90,30 @@ def get_plist(self) -> dict[str, Any]:
         except Exception as e:
             raise RuntimeError("Failed to parse Info.plist") from e
 
+    @sentry_sdk.trace
+    def get_archive_plist(self) -> dict[str, Any] | None:
+        """Get the archive-level Info.plist (not the app bundle's Info.plist)."""
+        if self._archive_plist is not None:
+            return self._archive_plist
+
+        xcarchive_dirs = list(self._extract_dir.glob("*.xcarchive"))
+        if not xcarchive_dirs:
+            logger.debug(f"No .xcarchive directory found in {self._extract_dir}")
+            return None
+
+        xcarchive_dir = xcarchive_dirs[0]
+        plist_path = xcarchive_dir / "Info.plist"
+
+        try:
+            with open(plist_path, "rb") as f:
+                plist_data = plistlib.load(f)
+
+            self._archive_plist = plist_data
+            return plist_data
+        except Exception:
+            logger.debug(f"Failed to parse archive Info.plist at {plist_path}", exc_info=True)
+            return None
+
     @sentry_sdk.trace
     def get_app_icon(self) -> bytes | None:
         """Get the primary app icon, decoded from crushed PNG format."""

src/launchpad/size/analyzers/apple.py

@@ -283,6 +283,13 @@ def _extract_app_info(self, xcarchive: ZippedXCArchive) -> AppleAppInfo:
                 profile_expiration_date = expiration_date.isoformat()
             certificate_expiration_date = self._extract_certificate_expiration_date(provisioning_profile)
 
+        build_date = None
+        archive_plist = xcarchive.get_archive_plist()
+        if archive_plist:
+            creation_date = archive_plist.get("CreationDate")
+            if creation_date:
+                build_date = creation_date.isoformat()
+
         supported_platforms = plist.get("CFBundleSupportedPlatforms", [])
         is_simulator = "iphonesimulator" in supported_platforms or plist.get("DTPlatformName") == "iphonesimulator"
 
@@ -319,6 +326,7 @@ def _extract_app_info(self, xcarchive: ZippedXCArchive) -> AppleAppInfo:
             minimum_os_version=plist.get("MinimumOSVersion", "Unknown"),
             supported_platforms=supported_platforms,
             sdk_version=plist.get("DTSDKName"),
+            build_date=build_date,
             is_simulator=is_simulator,
             codesigning_type=codesigning_type,
             profile_name=profile_name,

src/launchpad/size/models/apple.py

@@ -50,6 +50,7 @@ class AppleAppInfo(BaseAppInfo):
     minimum_os_version: str = Field(..., description="Minimum app version")
     supported_platforms: List[str] = Field(default_factory=list, description="Supported platforms")
     sdk_version: str | None = Field(None, description="App SDK version used for build")
+    build_date: str | None = Field(None, description="Date when the archive was built (ISO format)")
     is_simulator: bool = Field(False, description="If the app is a simulator build")
     codesigning_type: str | None = Field(
         None, description="Type of codesigning used (development, adhoc, appstore, enterprise)"

tests/unit/test_apple_basic_info.py

@@ -20,6 +20,8 @@ def test_basic_info(self, hackernews_xcarchive: Path) -> None:
         assert basic_info.minimum_os_version == "17.5"
         assert basic_info.supported_platforms == ["iPhoneOS"]
         assert basic_info.sdk_version == "iphoneos18.4"
+        assert basic_info.build_date is not None
+        assert basic_info.build_date == "2025-05-19T16:15:12"
         assert basic_info.is_simulator is False
         assert basic_info.codesigning_type == "development"
         assert basic_info.is_code_signature_valid is True