diff --git a/src/osekit/core/spectro_data.py b/src/osekit/core/spectro_data.py
index 127b122e..47f19581 100644
--- a/src/osekit/core/spectro_data.py
+++ b/src/osekit/core/spectro_data.py
@@ -17,7 +17,6 @@
 import matplotlib.pyplot as plt
 import numpy as np
 import pandas as pd
-from matplotlib.dates import date2num
 from pandas import Timedelta
 from scipy.signal import ShortTimeFFT, welch
 
@@ -428,7 +427,7 @@ def plot(
 
         sx = sx if scale is None else scale.rescale(sx_matrix=sx, original_scale=freq)
 
-        ax.xaxis_date()
+        ax.xaxis_date(tz=time.tz) if time.tz else ax.xaxis_date()
         ax.imshow(
             sx,
             vmin=self._v_lim[0],
@@ -437,7 +436,7 @@ def plot(
             origin="lower",
             aspect="auto",
             interpolation="none",
-            extent=(date2num(time[0]), date2num(time[-1]), freq[0], freq[-1]),
+            extent=(time[0], time[-1], freq[0], freq[-1]),
         )
 
     def get_db_value(self, sx: np.ndarray | None = None) -> np.ndarray:
diff --git a/tests/test_spectro.py b/tests/test_spectro.py
index 9fc38ae3..257ef8f0 100644
--- a/tests/test_spectro.py
+++ b/tests/test_spectro.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import contextlib
+import datetime
 import gc
 from contextlib import nullcontext
 from pathlib import Path
@@ -9,7 +10,6 @@
 import numpy as np
 import pandas as pd
 import pytest
-from matplotlib.dates import num2date
 from pandas import Timedelta, Timestamp
 from scipy.signal import ShortTimeFFT
 from scipy.signal.windows import hamming
@@ -1434,7 +1434,6 @@ def mock_imshow(
     assert plot_kwargs["interpolation"] == "none"
 
     t1, t2, f1, f2 = plot_kwargs["extent"]
-    t1, t2 = map(num2date, (t1, t2))
     t1, t2 = map(Timestamp, (t1, t2))
     assert t1 == sd.begin
     assert t2 == sd.end
@@ -1442,6 +1441,50 @@ def mock_imshow(
     assert f2 == sd.fft.f[-1]
 
 
+@pytest.mark.parametrize(
+    "audio_files",
+    [
+        {"date_begin": Timestamp("2026-01-01 00:00:00", tz="Europe/Paris")},
+        {"date_begin": Timestamp("2025-12-31 23:59:59", tz="+0300")},
+        {"date_begin": Timestamp("2025-12-31 23:59:59")},
+    ],
+    indirect=True,
+    ids=["%Z", "%z", "naive"],
+)
+def test_plot_timezone(
+    audio_files: tuple[list[AudioFile], ...],
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    audio_files, _ = audio_files
+    ad = AudioData.from_files(audio_files)
+    sd = SpectroData.from_audio_data(
+        data=ad,
+        fft=ShortTimeFFT(hamming(1024), 512, ad.sample_rate),
+    )
+
+    called_ax = set()
+
+    def mock_imshow(
+            self: plt.Axes,
+            sx: np.ndarray,
+            **kwargs: str,
+    ) -> None:
+        called_ax.add(self)
+
+    monkeypatch.setattr(plt.Axes, "imshow", mock_imshow)
+
+    _, ax = plt.subplots()
+    sd.plot(ax=ax)
+    spectro_data_axes = called_ax.pop()
+
+    if sd.begin.tz:
+        assert isinstance(spectro_data_axes.xaxis.units, datetime.tzinfo)
+    else:
+        assert spectro_data_axes.xaxis.units is None
+
+
+
+
 def test_spectro_default_v_lim(audio_files: pytest.fixture) -> None:
     files, _ = audio_files
     ad = AudioData.from_files(files)