diff --git a/app.py b/app.py
index 133df03..712cf42 100644
--- a/app.py
+++ b/app.py
@@ -8,7 +8,7 @@ import datetime
 try:
   from nicegui import app, ui, events, Client, run
 except ModuleNotFoundError as e:
-  print('Module `nicegui` not found.')
+  print(f'Error: {e}')
   exit(1)
 try:
   import plotly.graph_objects as pgo
@@ -18,7 +18,7 @@ try:
   import local_file_picker
   import plotly_resampler as prs
 except ModuleNotFoundError as e:
-  print('Module `plotly` not found.')
+  print(f'Error: {e}')
   exit(1)
 
 pio.templates["plotly_light"] = pgo.layout.Template(
@@ -87,6 +87,19 @@ def np2pgo(x, y, label=None):
     res.update({'name': label})
   return res
 
+def fntl():
+  if ELM['filename'] is not None:
+    return os.path.relpath(ELM['filename'], ELM['filedir'])
+
+def fnttt():
+  res = None
+  if ELM['filename'] is not None:
+    fn = os.path.basename(ELM['filename'])
+    n = len(fn)
+    if n == 18:
+      res = f'{fn[:4]}-{fn[4:6]}-{fn[6:8]} {fn[8:10]}:{fn[10:12]}:{fn[12:14]}'
+  return res
+
 async def pick_file() -> None:
   result = await local_file_picker.local_file_picker(ELM['filedir'], multiple=False)
   # ui.notify(f'You chose {result}')
@@ -96,11 +109,6 @@ async def pick_file() -> None:
     # see timer below, but still here active b/c the time might be inactive
     ui.timer(0, lambda: update_data(), once=True)
 
-    if filename is not None:
-      filename = os.path.relpath(filename, ELM['filedir'])
-      # filename = os.path.basename(filename)
-    ELM['label_file'].set_text(ELM['label_file_fmt'].format(filename=filename))
-
 def get_data(filename=ELM['filename']):
   data = None
   if filename is not None and os.path.isfile(filename):
@@ -238,11 +246,13 @@ def index():
     ).bind_value(app.storage.user, 'dark_mode').props('icon="dark_mode"')
 
   with ui.row():
-    filename = ELM['filename']
-    if filename is not None:
-      filename = os.path.relpath(filename, ELM['filedir'])
-      # filename = os.path.basename(filename)
-    ELM['label_file'] = ui.label(ELM['label_file_fmt'].format(filename=filename))
+    ELM['label_file'] = ui.label(ELM['label_file_fmt'].format(filename=fntl())) \
+                          .bind_text_from(ELM, 'filename',
+                                          lambda filename: ELM['label_file_fmt'].format(filename=fntl()))
+    ELM['label_file_tt'] = ui.tooltip(None) \
+                             .bind_text_from(ELM, 'filename', lambda filename: fnttt()) \
+                             .bind_visibility_from(ELM, 'filename', bool) \
+                             .move(ELM['label_file'])
     ELM['label_data_len'] = ui.label(ELM['label_data_len_fmt'].format(num=0, numa=0))
     ELM['label_data_temp'] = ui.label(ELM['label_data_temp_fmt'].format(min=0, max=0))
     ELM['label_data_heat'] = ui.label(ELM['label_data_heat_fmt'].format(min=0, max=0))
diff --git a/notes b/notes
index 610e41a..13173eb 100644
--- a/notes
+++ b/notes
@@ -1,2 +1,2 @@
 
-pip install numpy nicegui plotly kaleido
+pip install numpy nicegui plotly kaleido plotly-resampler pytz