Employers post their job offers themselves and therefore decide on starting and finishing dates.
Employers are the ones deciding these information.
It is thus unfortunately, not possible to apply to a job that has been closed by employer because it cannot be reopened.
However, you must know that on all the jobs' descriptions there is a deadline for applications date. This date is set by the employer according to the employer's needs and it is important to take it into account as a freelance contractor.