diff --git a/Project.toml b/Project.toml
index de91d96..c520e1d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -5,6 +5,7 @@ version = "0.1.0"
 
 [deps]
 BenchmarkTools = "6e4b80f9-dd63-53aa-95a3-0cdb28fa8baf"
+Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 Ipopt = "b6b21f68-93f8-5de0-b562-5493be1d77c9"
 IterativeSolvers = "42fd0dbc-a981-5370-80f2-aaf504508153"
diff --git a/src/QuantumGateDesign.jl b/src/QuantumGateDesign.jl
index 328652f..d9256e4 100644
--- a/src/QuantumGateDesign.jl
+++ b/src/QuantumGateDesign.jl
@@ -1,7 +1,8 @@
 module QuantumGateDesign
 
 
-import LinearMaps, IterativeSolvers, Plots, Ipopt, ForwardDiff, LinearAlgebra, BenchmarkTools, SparseArrays
+import LinearMaps, IterativeSolvers, Plots, Ipopt, ForwardDiff, LinearAlgebra
+import BenchmarkTools, SparseArrays, Dates
 using LinearAlgebra: mul!, axpy!, dot, tr, norm
 
 # Export derivative computation functions