diff --git a/playground/nutech/receipt/receipt.bpmn b/playground/nutech/receipt/receipt.bpmn
index 74911ce6..4f13dab3 100644
--- a/playground/nutech/receipt/receipt.bpmn
+++ b/playground/nutech/receipt/receipt.bpmn
@@ -149,7 +149,7 @@ seconds = 0
 days = 0
 
 # Extract the value after "PT"
-time_value_str = timer_value_tfc.split('PT')[1:]
+time_value_str = timer_value_tfc.split('PT')[1]
 
 # Populate values based on the selected time format
 if time_format == "Hour(s)":
@@ -160,14 +160,16 @@ elif time_format == "Second(s)":
     seconds = int(time_value_str[:-1]) if time_value_str[:-1].isdigit() else 0
 elif time_format == "Day(s)":
     days = int(time_value_str[:-1]) if time_value_str[:-1].isdigit() else 0
+
 # Store the end result in variable timer_value_tfc as a tuple
 timer_value_tfc = (days, hours, minutes, seconds)
 
-# Convert the tuple to a string
-timer_value_tfc_str = str(timer_value_tfc)
+# Convert the tuple to ISO 8601 string format
+timer_value_tfc_str = f"PT{timer_value_tfc[1]}H{timer_value_tfc[2]}M{timer_value_tfc[3]}S"
 
-# Now timer_value_tfc_str contains the string representation of the tuple
-print(timer_value_tfc_str)</bpmn:script>
+# Now timer_value_tfc_str contains the ISO 8601 string representation of the tuple
+print(timer_value_tfc_str)
+</bpmn:script>
     </bpmn:scriptTask>
     <bpmn:userTask id="Activity_0ejewop" name="Receive Equipment at SASD Gate area">
       <bpmn:extensionElements>