diff --git a/docs/adrs/202405-bidcollect.md b/docs/adrs/202405-bidcollect.md
index aaf633b..abec029 100644
--- a/docs/adrs/202405-bidcollect.md
+++ b/docs/adrs/202405-bidcollect.md
@@ -35,7 +35,6 @@ go run . service bidcollect --out csv  --data-api --ultrasound-stream
 
 - Diagram showing the flow of data and the components involved
 - File Output
-  - Use date in output directory
   - Combine all individual files into a big file
   - Consider gzipped CSV output: https://gist.github.com/mchirico/6147687 (currently, an hour of bids is about 300MB)
   - Consider Parquet output files
diff --git a/services/bidcollect/bid-processor.go b/services/bidcollect/bid-processor.go
index 8cbb2bf..8178298 100644
--- a/services/bidcollect/bid-processor.go
+++ b/services/bidcollect/bid-processor.go
@@ -118,7 +118,7 @@ func (c *BidProcessor) getFiles(bid *CommonBid) (fAll, fTop *os.File, err error)
 	// hourlybucket
 	sec := int64(bucketMinutes * 60)
 	bucketTS := bid.ReceivedAt / sec * sec // timestamp down-round to start of bucket
-	// t := time.Unix(bucketTS, 0).UTC()
+	t := time.Unix(bucketTS, 0).UTC()
 
 	// files may already be opened
 	c.outFilesLock.RLock()
@@ -130,13 +130,14 @@ func (c *BidProcessor) getFiles(bid *CommonBid) (fAll, fTop *os.File, err error)
 	}
 
 	// Create output files
-	err = os.MkdirAll(c.opts.OutDir, os.ModePerm)
+	dir := filepath.Join(c.opts.OutDir, t.Format(time.DateOnly))
+	err = os.MkdirAll(dir, os.ModePerm)
 	if err != nil {
 		return nil, nil, err
 	}
 
 	// Open ALL BIDS CSV
-	fnAll := filepath.Join(c.opts.OutDir, c.getFilename("all", bucketTS))
+	fnAll := filepath.Join(dir, c.getFilename("all", bucketTS))
 	fAll, err = os.OpenFile(fnAll, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o600)
 	if err != nil {
 		return nil, nil, err
@@ -153,7 +154,7 @@ func (c *BidProcessor) getFiles(bid *CommonBid) (fAll, fTop *os.File, err error)
 	}
 
 	// Open TOP BIDS CSV
-	fnTop := filepath.Join(c.opts.OutDir, c.getFilename("top", bucketTS))
+	fnTop := filepath.Join(dir, c.getFilename("top", bucketTS))
 	fTop, err = os.OpenFile(fnTop, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o600)
 	if err != nil {
 		return nil, nil, err
diff --git a/services/bidcollect/data-api-poller.go b/services/bidcollect/data-api-poller.go
index d76e51a..8625d5e 100644
--- a/services/bidcollect/data-api-poller.go
+++ b/services/bidcollect/data-api-poller.go
@@ -47,6 +47,7 @@ func (poller *DataAPIPoller) Start() {
 	tNextSlot := common.SlotToTime(nextSlot)
 	untilNextSlot := tNextSlot.Sub(t)
 	time.Sleep(untilNextSlot)
+	poller.Log.Infof("[data-api poller] waiting until start of next slot (%d, %s from now)", nextSlot, untilNextSlot.String())
 
 	// then run polling loop
 	for {