diff --git a/.github/workflows/upload.yml b/.github/workflows/upload.yml
index 3db3edb..975e95e 100644
--- a/.github/workflows/upload.yml
+++ b/.github/workflows/upload.yml
@@ -1,6 +1,6 @@
 # Workflow to test automatic uploading to Sciebo
 
-name: Upload Testfile 
+name: Upload data 
 
 # Controls when the action will run. Workflow runs when manually triggered using the UI
 # or API.
diff --git a/calc_all.py b/calc_all.py
index 7f386d0..a76cc1a 100644
--- a/calc_all.py
+++ b/calc_all.py
@@ -218,7 +218,8 @@ def calc_checksum():
     print("#"*50)
     print("Calculating the checksum.")
     t1 = time.time()
-    datestr = "-".join([str(x) for x in time.localtime()[:3]])
+    # datestr format YYYY-MM-DD
+    datestr = "-".join([str(x).zfill(2) for x in time.localtime()[:3]])
     checksum = subprocess.run(["md5sum", "data-"+datestr+".tar.gz"],
                     capture_output=True, text=True).stdout
     with open("data-"+datestr+".tar.gz-CHECKSUM", 'w') as f: