diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..68107df
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,41 @@
+name: Test viewer 
+
+on:
+  push:
+    branches: [ main, development, test* ]
+  pull_request:
+    branches: [ main, development, test* ]
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.runs-on }}
+    strategy:
+      fail-fast: false
+      matrix:        
+        runs-on: [ubuntu-latest]
+        python-version: [ "3.10", "3.12" ]
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Python  ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version:  ${{ matrix.python-version }}
+
+        
+    - name: Install dependencies
+      run: |
+       sudo apt-get update
+        sudo apt-get install ffmpeg -y 
+        pip install numpy matplotlib ruff 
+
+    - name: Test WCONViewer
+      run: |
+        ./test_all.sh
+        
+      
+    - name: Print info on files
+      run: |
+        ls -alt
diff --git a/.gitignore b/.gitignore
index 225fc6f..6cd32ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /__pycache__
+/.DS_Store
diff --git a/Player.py b/Player.py
index 5dc9a1c..94ac666 100644
--- a/Player.py
+++ b/Player.py
@@ -19,6 +19,8 @@ def __init__(
         mini=0,
         maxi=100,
         pos=(0.125, 0.92),
+        times=None,
+        t_units="",
         **kwargs,
     ):
         self.i = 0
@@ -39,6 +41,8 @@ def __init__(
             save_count=save_count,
             **kwargs,
         )
+        self.times = times
+        self.t_units = t_units
 
     def play(self):
         while self.runs:
@@ -82,6 +86,7 @@ def onestep(self):
             self.i -= 1
         self.func(self.i)
         self.slider.set_val(self.i)
+
         self.fig.canvas.draw_idle()
 
     def setup(self, pos):
@@ -105,14 +110,32 @@ def setup(self, pos):
         self.slider = matplotlib.widgets.Slider(
             sliderax, "", self.min, self.max, valinit=self.i
         )
+        self.slider.valtext.set_visible(False)
         self.slider.on_changed(self.set_pos)
+        self.slider.label.set_horizontalalignment("left")
+        label_position = self.slider.label.get_position()  # Get the current position
+        self.slider.label.set_position(
+            (label_position[0] + 1.1, label_position[1])
+        )  # Adjust x-coordinate
+
+        # self.text_box = matplotlib.widgets.TextBox(textax, label="", initial="0 ms")
 
     def set_pos(self, i):
         self.i = int(self.slider.val)
         self.func(self.i)
+        self.set_time_text(self.i)
+
+    def set_time_text(self, i):
+        time_text = str(i)
+        if self.times is not None:
+            time_text = "%s%s" % (self.times[i], self.t_units)
+
+        # self.text_box.set_val(time_text)
+        self.slider.label.set_text(time_text)
 
     def update(self, i):
         self.slider.set_val(i)
+        self.set_time_text(i)
 
 
 if __name__ == "__main__":
diff --git a/WormView.py b/WormView.py
index d85e7f1..1263564 100644
--- a/WormView.py
+++ b/WormView.py
@@ -127,12 +127,22 @@ def main():
 
         ax.set_ylim([-1.5, 1.5])
 
-    t = np.array(wcon["data"][0]["t"])
+    t_units = ""
+    x_units = ""
+    y_units = ""
+
+    if "units" in wcon:
+        t_units = wcon["units"].get("t")
+        x_units = wcon["units"].get("x")
+        y_units = wcon["units"].get("y")
+        print(f"Time units: {t_units}, x units: {x_units}, y units: {y_units}")
+
+    times = np.array(wcon["data"][0]["t"])
     x = np.array(wcon["data"][0]["x"]).T
     y = np.array(wcon["data"][0]["y"]).T
 
     print(
-        f"Range of time: {t[0]}->{t[0]}; x range: {x.max()}->{x.min()}; y range: {y.max()}->{y.min()}"
+        f"Range of time: {times[0]}{t_units}->{times[-1]}{t_units}; x range: {x.max()}{x_units}->{x.min()}{x_units}; y range: {y.max()}{y_units}->{y.min()}{y_units}"
     )
     factor = 0.05
     if abs(x.max() - x.min()) > abs(y.max() - y.min()):
@@ -146,7 +156,7 @@ def main():
         mid = (x.max() + x.min()) / 2
         ax.set_xlim([mid - side * (0.5 + factor), mid + side * (0.5 + factor)])
 
-    num_steps = t.size
+    num_steps = times.size
 
     if "px" in wcon["data"][0] and "py" in wcon["data"][0]:
         if args.ignore_wcon_perimeter:
@@ -170,13 +180,14 @@ def main():
     def update(ti):
         global midline_plot, perimeter_plot
         f = ti / num_steps
+        t = times[ti]
 
         color = "#%02x%02x00" % (int(0xFF * (f)), int(0xFF * (1 - f) * 0.8))
-        print("Time step: %s, fract: %f, color: %s" % (ti, f, color))
+        print("Time %s%s, step: %s, fract: %f, color: %s" % (t, t_units, ti, f, color))
 
         if midline_plot is None:
             (midline_plot,) = ax.plot(
-                x[:, ti], y[:, ti], color="g", label="t=%sms" % t[ti], linewidth=0.5
+                x[:, ti], y[:, ti], color="g", label="t=%sms" % times[ti], linewidth=0.5
             )
         else:
             midline_plot.set_data(x[:, ti], y[:, ti])
@@ -189,7 +200,9 @@ def update(ti):
             else:
                 perimeter_plot.set_data(px[:, ti], py[:, ti])
 
-    anim = Player(fig, update, maxi=num_steps - 1)
+    anim = Player(
+        fig, update, maxi=num_steps - 1, times=[t for t in times], t_units=t_units
+    )
 
     # TODO WormViewCSV and WormViewWCON - should WormViewCSV just be the original WormView? That's what it initially did.
     # TODO Could take out Player and WormViewWCON into separate repo - Taking out Player could be ugly. It is quite coupled with WormView due to the update function.