The latest payslip and bank statement must be dated no earlier than 28 days before the date you submit the online application, and no later than the date you submit the online application.
Therefore if you will be applying no later than January 22nd, then your latest payslip and bank statement must be dated between:
25th December and 22nd January
So, if you were last paid on December 28th, with your payslip dated December 31st, then you use the December payslip and corresponding bank statement.
So that means that the 6 months you must cover are:
June 28th to December 28th
And if you are paid on the 28th but the payslip says 30th or 31st, you will need the payslips and bank statements from:
May 31st to December 31st in order to explicitly cover the days of June 28, 29 and 30th.
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