Maternity Benefit Act - completed 80 days of service in previous 12 months?

Dear All,
I have a question. As per The Maternity Benefit Act. Women employee must have completed 80 days of service in previous 12 months.
What is this 12 month period roll for considering a women employee for the said benefit.
Does it mean she should have joined before 12 month or this sentence only specify the limit for calculating 80 days for eligibility.
You all requested to provide guidance on above matter.
Regards,
Rahul Sindhwani

Hi,
The meaning of sentence is, benefit is applicable to female employee who have worked at least 80 days before she declares her pregnancy. For eg : If any women is not coming to work for 12 months due to any personal or health reason and if she comes and ask for Maternity Benefit then it may not be applicable to her.