Update utils.py

utils.py

@@ -123,4 +123,39 @@ def is_safe_path(path: str, base_path: str) -> bool:
     target = os.path.abspath(os.path.join(base, path))
     
     # Check if target is under base
-    return target.startswith(base)
+    return target.startswith(base)
+
+def get_current_timestamp() -> str:
+    """
+    Get current UTC timestamp in ISO format with Z suffix
+    Returns: "2025-01-10T12:00:00.123Z"
+    """
+    return datetime.now(timezone.utc).isoformat().replace('+00:00', 'Z')
+
+def normalize_timestamp(timestamp: Optional[str]) -> str:
+    """
+    Normalize timestamp string for consistent comparison
+    Handles various formats:
+    - "2025-01-10T12:00:00Z"
+    - "2025-01-10T12:00:00.000Z"  
+    - "2025-01-10T12:00:00+00:00"
+    - "2025-01-10 12:00:00+00:00"
+    """
+    if not timestamp:
+        return ""
+    
+    # Normalize various formats
+    normalized = timestamp.replace(' ', 'T')  # Space to T
+    normalized = normalized.replace('+00:00', 'Z')  # UTC timezone
+    
+    # Remove milliseconds if present for comparison
+    if '.' in normalized and normalized.endswith('Z'):
+        normalized = normalized.split('.')[0] + 'Z'
+    
+    return normalized
+
+def timestamps_equal(ts1: Optional[str], ts2: Optional[str]) -> bool:
+    """
+    Compare two timestamps regardless of format differences
+    """
+    return normalize_timestamp(ts1) == normalize_timestamp(ts2)