diff --git a/Project.toml b/Project.toml
index ea90178..c007d0a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -3,6 +3,7 @@ uuid = "3587e190-3f89-42d0-90ee-14403ec27112"
 version = "0.1.13"
 
 [deps]
+Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [weakdeps]
diff --git a/src/InverseFunctions.jl b/src/InverseFunctions.jl
index 0c5438b..3710fbe 100644
--- a/src/InverseFunctions.jl
+++ b/src/InverseFunctions.jl
@@ -13,4 +13,8 @@ include("inverse.jl")
 include("setinverse.jl")
 include("test.jl")
 
+@static if !isdefined(Base, :get_extension)
+    include("../ext/DatesExt.jl")
+end
+
 end # module
diff --git a/test/test_inverse.jl b/test/test_inverse.jl
index 3eaf976..5798127 100644
--- a/test/test_inverse.jl
+++ b/test/test_inverse.jl
@@ -125,7 +125,7 @@ end
     end
 end
 
-VERSION ≥ v"1.9" && @testset "dates" begin
+@testset "dates" begin
     InverseFunctions.test_inverse(Dates.date2epochdays, Date(2020, 1, 2); compare = ===)
     InverseFunctions.test_inverse(Dates.datetime2epochms, DateTime(2020, 1, 2, 12, 34, 56); compare = ===)
     InverseFunctions.test_inverse(Dates.epochdays2date, Int64(1234); compare = ===)