Evidence Document 28 day rule for payslips

[AlecandAlice]

So my payslips have no specific date on them, just the month. I usually get paid on the 25th of every month. Is the effective date, for age of document purposes, the last day of that month? (so for my october payslip the last date i would need to use it by is the 27th of November otherwise then I would need to use the November slip) OR should I use the 25th as the cut off date as that is when I am paid so the reference point in my bank statement would show this date. My Wife's appointment is on the 25th November so I think I am ok to submit October's payslip as the last one (considering I would get the payslip for november on the 26th most likely). We're worrying that I will need to go pick up my payslip and new bank statement on the day of the interview. Please help!

Sorry for my waffle. I'm new!