diff --git a/pandas/_libs/tslibs/timestamps.pyx b/pandas/_libs/tslibs/timestamps.pyx
index 70d0bf433cd44..afbefd9b84461 100644
--- a/pandas/_libs/tslibs/timestamps.pyx
+++ b/pandas/_libs/tslibs/timestamps.pyx
@@ -3492,7 +3492,7 @@ default 'raise'
             year -= 1
             month += 12
         return (day +
-                np.fix((153 * month - 457) / 5) +
+                np.trunc((153 * month - 457) / 5) +
                 365 * year +
                 np.floor(year / 4) -
                 np.floor(year / 100) +
diff --git a/pandas/core/arrays/datetimes.py b/pandas/core/arrays/datetimes.py
index 4cf5f4b13890e..9b7ae26bef899 100644
--- a/pandas/core/arrays/datetimes.py
+++ b/pandas/core/arrays/datetimes.py
@@ -2287,7 +2287,7 @@ def to_julian_date(self) -> npt.NDArray[np.float64]:
         month[testarr] += 12
         return (
             day
-            + np.fix((153 * month - 457) / 5)
+            + np.trunc((153 * month - 457) / 5)
             + 365 * year
             + np.floor(year / 4)
             - np.floor(year / 100)