diff --git a/src/algorithms/expval.jl b/src/algorithms/expval.jl
index 0668a82c..cc119fe8 100644
--- a/src/algorithms/expval.jl
+++ b/src/algorithms/expval.jl
@@ -162,19 +162,19 @@ expectation_value(Ψ::WindowMPS,windowH::Window, at::Int64) = expectation_value(
 expectation_value(Ψ::WindowMPS,windowH::Window, windowEnvs=environments(Ψ,windowH)) = expectation_value(Ψ,windowH, 0., windowEnvs) 
 
 # with time argument
-function expectation_value(Ψ::WindowMPS,windowH::Window,t::Number,at::Int64)
+function expectation_value(Ψ::WindowMPS,windowOp::Window,t::Number,at::Int64)
     if at < 1
-        return expectation_value(Ψ.left_gs,windowH.left,t,at)
+        return expectation_value(Ψ.left_gs,windowOp.left,t,at)
     elseif 1 <= at <= length(Ψ.window)
-        return expectation_value(Ψ,windowH.middle,t,at)
+        return expectation_value(Ψ,windowOp.middle,t,at)
     else
-        return expectation_value(Ψ.right_gs,windowH.right,t,at)
+        return expectation_value(Ψ.right_gs,windowOp.right,t,at)
     end
 end
 
 function expectation_value(Ψ::WindowMPS,windowH::Window,t::Number,windowEnvs::Window{C,D,C}=environments(Ψ,windowH)) where {C <: Union{MultipleEnvironments,Cache}, D <: Union{MultipleEnvironments,Cache}}
     left = expectation_value(Ψ.left_gs,windowH.left,t,windowEnvs.left)
-    middle = expectation_value(Ψ,windowH.middle,t,windowEnvs.middle)
+    middle = expectation_value(Ψ.window,windowH.middle,t,windowEnvs.middle)
     right = expectation_value(Ψ.right_gs,windowH.right,t,windowEnvs.right)
     return [left.data...,middle...,right.data...]
 end
\ No newline at end of file
diff --git a/src/algorithms/timestep/windowtdvp.jl b/src/algorithms/timestep/windowtdvp.jl
index 4208abaa..22bc064d 100644
--- a/src/algorithms/timestep/windowtdvp.jl
+++ b/src/algorithms/timestep/windowtdvp.jl
@@ -98,18 +98,18 @@ function timestep!(Ψ::WindowMPS, H::Window, t::Number, dt::Number,alg::TDVP,env
     #left to right sweep on window
     for i in 1:(length(Ψ)-1)
         h_ac = ∂∂AC(i,Ψ,H.middle,env.middle);
-        Ψ.AC[i], converged, convhist = integrate(h_ac,Ψ.AC[i],t,-1im,dt/2,alg.integrator)
+        Ψ.AC[i], converged, convhist = integrate(h_ac,Ψ.AC[i],t+dt/2,-1im,dt/2,alg.integrator)
         converged == 0 &&
                 @info "time evolving ac($i) failed $(convhist.normres)"
 
         h_c = ∂∂C(i,Ψ,H.middle,env.middle);
-        Ψ.CR[i], converged, convhist = integrate(h_c,Ψ.CR[i],t,-1im,-dt/2,alg.integrator)
+        Ψ.CR[i], converged, convhist = integrate(h_c,Ψ.CR[i],t+dt/2,-1im,-dt/2,alg.integrator)
         converged == 0 &&
                 @info "time evolving c($i) failed $(convhist.normres)"
     end
 
     h_ac = ∂∂AC(length(Ψ),Ψ,H.middle,env.middle);
-    Ψ.AC[end], converged, convhist = integrate(h_ac,Ψ.AC[end],t,-1im,dt/2,alg.integrator)
+    Ψ.AC[end], converged, convhist = integrate(h_ac,Ψ.AC[end],t+dt/2,-1im,dt/2,alg.integrator)
     converged == 0 &&
             @info "time evolving ac($(length(Ψ))) failed $(convhist.normres)"
 
@@ -159,7 +159,7 @@ function timestep!(Ψ::WindowMPS, H::Window, t::Number, dt::Number,alg::TDVP2,en
     for i in 1:(length(Ψ)-1)
         h_ac2 = ∂∂AC2(i,Ψ,H.middle,env.middle);
         ac2 = Ψ.AC[i]*_transpose_tail(Ψ.AR[i+1]);
-        ac2, converged, convhist = integrate(h_ac2,ac2,t,-1im,dt/2,alg.integrator)
+        ac2, converged, convhist = integrate(h_ac2,ac2,t+dt/2,-1im,dt/2,alg.integrator)
         converged == 0 &&
                 @info "time evolving ac2($i) failed $(convhist.normres)"
         (U,S,V) = tsvd(ac2, alg = TensorKit.SVD(), trunc = alg.trscheme);
@@ -169,7 +169,7 @@ function timestep!(Ψ::WindowMPS, H::Window, t::Number, dt::Number,alg::TDVP2,en
 
         if i < length(Ψ) - 1
             h_ac = ∂∂AC(i+1,Ψ,H.middle,env.middle);
-            Ψ.AC[i+1], converged, convhist = integrate(h_ac,Ψ.AC[i+1],t,-1im,-dt/2,alg.integrator)
+            Ψ.AC[i+1], converged, convhist = integrate(h_ac,Ψ.AC[i+1],t+dt/2,-1im,-dt/2,alg.integrator)
             converged == 0 &&
                 @info "time evolving ac($i) failed $(convhist.normres)"
         end