Trending @Accenture; Suggestion on Resignation

Hello Folks,

I joined Accenture as fresher in Sept 2021 and Currently at Level 11. Yesterday, I received a offer with almost 50% hike. But, during HR discussion, I mentioned my notice period as 60 days. Now, new company has scheduled my joining date in less than 60 days and same is mentioned in offer letter. Shall I ask the HR to revise my joining date now itself before putting resignation in Accenture or shall I wait and ask for revised joining date before 10-15 days of current joining date?

TIA..