diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
index bd27bef3759a..ac79c441ab9a 100644
--- a/lib/matplotlib/dates.py
+++ b/lib/matplotlib/dates.py
@@ -207,9 +207,9 @@ def _get_rc_timezone():
def _to_ordinalf(dt):
"""
- Convert :mod:`datetime` or :mod:`date` to the Gregorian date as UTC float
- days, preserving hours, minutes, seconds and microseconds. Return value
- is a :func:`float`.
+ Convert :mod:`datetime`, :mod:`date` or :mod:`timedelta` to the Gregorian
+ date as UTC float days, preserving hours, minutes, seconds and
+ microseconds. Return value is a :func:`float`.
"""
# Convert to UTC
tzi = getattr(dt, 'tzinfo', None)
@@ -217,6 +217,9 @@ def _to_ordinalf(dt):
dt = dt.astimezone(UTC)
tzi = UTC
+ if isinstance(dt, datetime.timedelta):
+ return dt.total_seconds() / SEC_PER_DAY
+
base = float(dt.toordinal())
# If it's sufficiently datetime-like, it will have a `date()` method
diff --git a/lib/matplotlib/tests/test_dates.py b/lib/matplotlib/tests/test_dates.py
index 5a25e6182b7e..003789951598 100644
--- a/lib/matplotlib/tests/test_dates.py
+++ b/lib/matplotlib/tests/test_dates.py
@@ -466,3 +466,10 @@ 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._to_ordinalf(dt)
+ assert ordinalf == 1 / (24 * 60)
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