How to give time dependent input?

Description of problem

I want to give input in my model at different time step

Minimal code to reproduce problem

input = 60pA(t>60*ms)

What you have aready tried

Expected output (if relevant)

Actual output (if relevant)

Full traceback of error (if relevant)

Hi Jitender, did you have a look at Input stimuli — Brian 2 2.4.2 documentation ? You should find everything you need there.