Phase Linearity and Time Sidelobes

Hi all,
I usually get good info from here so please don't let me down.

Has anyone ever transformed Phase (of a filter) into the time domain to calculate the time sidelobes produced?
To my knowledge, this is exactly like taking the Impulse Response, but focusing only on Theta and disregarding the Magnitude.

Not that it matters, but I will be using a weighting function before plotting the resulting sidelobes.

Please discuss.