diff --git a/src/claude_memory/api/app.py b/src/claude_memory/api/app.py
index 756084b..15bd2c1 100644
--- a/src/claude_memory/api/app.py
+++ b/src/claude_memory/api/app.py
@@ -69,7 +69,7 @@ async def sync_memories(
 
     async with pool.acquire() as conn:
         if since:
-            since_dt = datetime.fromisoformat(since)
+            since_dt = datetime.fromisoformat(since.replace(' ', '+'))
             rows = await conn.fetch(
                 """
                 SELECT id, content, category, tags, expanded_keywords, importance,