Can I finish my pg.

I recently got a job in a nationalized bank based on my graduation and will be posted in October or November. On the other hand am pursuing pg and about to finish in next February. I have no complications in completing pg as project viva voice is pending, which needs hardly one day leave. My question is do I have to inform about pg to my organisation, will they have anything to object. Is it legal to complete my pg. Thank you.