How do you update a variable in a timestep loop?

I have many equations in a for loop that will need to be updated with each iteration of 1 through 60 with dt being 1 (so 1,2,3,4,5...60). The variable in each equation needing to be updated is dt. First time through it will be 1, second time through it will be 2, so on and so forth. How can I do this?

[per isakson]

for jj = 1:60
    dt = jj;
    ...
end

or I missed something