diff --git a/test/Core.jl b/test/Core.jl
index e8375f00..d9e319d3 100644
--- a/test/Core.jl
+++ b/test/Core.jl
@@ -676,9 +676,6 @@ end
 
 @testitem "datetime" begin
     using Dates
-    using CondaPkg
-    CondaPkg.add("numpy")
-
     dt = pyimport("datetime")
     x1 = pydate(2001, 2, 3)
     @test pyisinstance(x1, dt.date)
diff --git a/test/Numpy.jl b/test/Numpy.jl
new file mode 100644
index 00000000..1d812106
--- /dev/null
+++ b/test/Numpy.jl
@@ -0,0 +1,57 @@
+@testitem "timedelta64" begin
+    using Dates
+    using CondaPkg
+    CondaPkg.add("numpy")
+    
+    td = pyimport("numpy").timedelta64
+    @testset for x in [
+        -1_000_000_000,
+        -1_000_000,
+        -1_000,
+        -1,
+        0,
+        1,
+        1_000,
+        1_000_000,
+        1_000_000_000,
+    ], (Unit, unit, pyunit) in [
+        (Nanosecond, :nanoseconds, :ns),
+        (Microsecond, :microseconds, :us),
+        (Millisecond, :milliseconds, :ms),
+        (Second, :seconds, :s),
+        (Minute, :minutes, :m),
+        (Hour, :hours, :h),
+        (Day, :days, :D),
+        (Week, :weeks, :W),
+        (Month, :months, :M),
+        (Year, :years, :Y),
+    ]
+        y = pytimedelta64(; [unit => x]...)
+        y2 = pytimedelta64(Unit(x))
+        @test pyeq(Bool, y, y2)
+        @test pyeq(Bool, y, td(x, "$pyunit"))
+    end
+end
+
+@testitem "datetime64" begin
+    using Dates
+    using CondaPkg
+    CondaPkg.add("numpy")
+    
+    y = 2024
+    m = 2
+    d = 29
+    h = 23
+    min = 59
+    s = 58
+    ms = 999
+    us = 998
+    ns = 997
+
+    date = DateTime(y, m, d, h, min, s, ms)
+    pydate = pydatetime64(date)
+    pydate2 = pydatetime64(year = y, month = m, day = d, hour = h, minute = min, second = s, millisecond = ms)
+    dt = date - Second(0)
+    pydate3 = pydatetime64(dt)
+    @test pyeq(Bool, pydate, pydate2)
+end
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