diff --git a/domain/abri/slots.py b/domain/abri/slots.py
index dac582569..992426ee9 100644
--- a/domain/abri/slots.py
+++ b/domain/abri/slots.py
@@ -1,7 +1,13 @@
+from datetime import datetime, time
 from typing import Optional
 
 from domain.abri.models import SlotCode
 
+_MIDDAY = time(12, 0)
+
 
 def slot_for_confirmed_time(confirmed_time: Optional[str]) -> SlotCode:
-    return "AD"
+    if confirmed_time is None or confirmed_time.strip() == "":
+        return "AD"
+    parsed = datetime.strptime(confirmed_time.strip(), "%H:%M").time()
+    return "AM" if parsed < _MIDDAY else "PM"