The screenshot above shows a Pluto.jl notebook where you can select a pair of dates and find the change in the treasury curve's zero rates.
Because JuliaActuary doesn't have an active server to run this on, you have to run it locally. Assuming that you already have Julia installed but still need to install Pluto notebooks:
Open a Julia REPL and copy and paste the following:
# install these dependencies import Pkg; Pkg.add(["Pluto"]) # use and start Pluto using Pluto; Pluto.run()
In the Pluto window that opens, enter this URL into the
Open from file: box: