OUTPUT_LOCAL_TIME "Y" for c1c2 c3 in NEI2017 emf run script


I have a quick question. I am not sure why OUTPUT_LOCAL_TIME “Y” for cmv_c1c2 cmv_c3 in NEI2017 EMF run script. Could I know the reason for this?
If run model using emission with GMT, I should set OUTPUT_LOCAL_TIME “N", right?

Thank you.