get oldest file's timestamp

cal_tools/cal_tools/tools.py

@@ -425,7 +425,7 @@ def get_notebook_name():
         return environ.get("CAL_NOTEBOOK_NAME", "Unknown Notebook")
 
 
-def get_dir_creation_date(directory, run):
+def get_dir_creation_date(directory, run, tsdir=False):
     """
     Return modification time of [directory]/[run]04
 
@@ -433,8 +433,14 @@ def get_dir_creation_date(directory, run):
     :param run: run number
     :return: (datetime) modification time
     """
-    creation_time = stat("{}/r{:04d}".format(directory, run)).st_mtime
-    creation_time = datetime.datetime.fromtimestamp(creation_time)
+    if tsdir:
+        creation_time = stat("{}/r{:04d}".format(directory, run)).st_mtime
+    else:
+        rfiles = glob("{}/r{:04d}/*.h5".format(directory, run))
+        rfiles.sort(key=path.getmtime)
+        creation_time = stat(rfiles[0]).st_mtime
+
+    creation_time = datetime.datetime.fromtimestamp(creation_time)     
     return creation_time