[x] Situation 1: Current date < start date. -----> Don't allow create new poll
Allow delete this poll
Allow edit start date, sub end date, final end date
[x] Situation 2: start date <= current date <= subend date -----> Don't allow create new poll
Don't allow delete this poll
Allow edit sub end date, final end date
Don't allow edit start date
[x] Situation 3: subend date < current date -----> Allow create new poll.
Don't allow delete this poll
Allow edit final end date
Don't allow edit start date, final date
[x] Situation 1: Current date < start date. -----> Don't allow create new poll Allow delete this poll Allow edit start date, sub end date, final end date
[x] Situation 2: start date <= current date <= subend date -----> Don't allow create new poll Don't allow delete this poll Allow edit sub end date, final end date Don't allow edit start date
[x] Situation 3: subend date < current date -----> Allow create new poll.
Don't allow delete this poll Allow edit final end date Don't allow edit start date, final date