diff --git a/dap/accumulator.py b/dap/accumulator.py
index 904fa24..435e805 100644
--- a/dap/accumulator.py
+++ b/dap/accumulator.py
@@ -3,7 +3,7 @@ import argparse
 from bsread.sender import Sender, PUB
 
 from utils import FileHandler, Sorter
-from zmqsocks import ZMQSocketsAccumulator, make_address
+from zmqsocks import ZMQSocketsAccumulator, make_address, make_bsread_timestamp
 
 
 OUTPUT_DIR = "/gpfs/photonics/swissfel/buffer/dap/data"
@@ -62,6 +62,7 @@ def accumulate(accumulator_addr, bsread_port):
 
         to_copy = (
             "pulse_id",
+            "timestamp",
             "frame",
             "is_good_frame",
             "number_of_spots",
@@ -73,7 +74,9 @@ def accumulate(accumulator_addr, bsread_port):
         sorter.add(pulse_id, data)
         ready = sorter.flush_ready()
         for pulse_id, data in ready:
-            sender.send(pulse_id=pulse_id, data=data) #TODO: is there a timestamp in the input?
+            timestamp = results["timestamp"]
+            timestamp = make_bsread_timestamp(timestamp, pulse_id)
+            sender.send(pulse_id=pulse_id, data=data, timestamp=timestamp)