I have collaborated some of the information for dates and links for admissions to old IITS. This can be integrated with important dates (https://gatecse.in/important-dates/) that is present in GO(used the same column format). Maybe Some of the admins can integrate the same.
Also turned the link for editing. Maybe others can also contribute.
Thanks admins for ordering the dates and integrating the same in
I missed to include the data for IIT madras earlier. It's added by someone else now.
Please add that also.
Refer this link. Last date is 18 April.