diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
index a229e09f5e63..5673a24c72ab 100644
--- a/lib/matplotlib/dates.py
+++ b/lib/matplotlib/dates.py
@@ -271,6 +271,17 @@ def _dt64_to_ordinalf(d):
return dt
+def _tdelta_to_ordinalf(tdelta):
+ """
+ Convert :mod:`timedelta` to total days. Return value is a :func:`float`
+ """
+ return tdelta.total_seconds() / SEC_PER_DAY
+
+
+# a version of _tdelta_to_ordinalf that can operate on numpy arrays
+_tdelta_to_ordinalf_np_vectorized = np.vectorize(_tdelta_to_ordinalf)
+
+
def _from_ordinalf(x, tz=None):
"""
Convert Gregorian float of the date, preserving hours, minutes,
diff --git a/lib/matplotlib/tests/test_dates.py b/lib/matplotlib/tests/test_dates.py
index db153be5ff97..9d14474a2a0e 100644
--- a/lib/matplotlib/tests/test_dates.py
+++ b/lib/matplotlib/tests/test_dates.py
@@ -641,3 +641,10 @@ def test_tz_utc():
def test_num2timedelta(x, tdelta):
dt = mdates.num2timedelta(x)
assert dt == tdelta
+
+
+def test_timedelta_ordinalf():
+ # Check that timedeltas can be converted to ordinalfs
+ dt = datetime.timedelta(seconds=60)
+ ordinalf = mdates._tdelta_to_ordinalf(dt)
+ assert ordinalf == 1 / (24 * 60)
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