28 day rule

I just want to clarify this, because I think I'm overthinking it and making it more complicated than it actually is, as per usual.

When the UKVI says "no earlier than 28 days" for pay slips, does that mean the application should be made WITHIN 28 days of the latest pay slip?  So my fiancé gets his 6 months worth of payslips April 1, so we should apply by April 29, is this correct?

I assume this also applies for supporting evidence, e.g. letters from employers, landlords, etc.

Or do I have it all backwards, which is entirely possible...

Once again, thanks in advance for any reply.  This board is a life saver...

On the day of application which is the day you submit and pay your most recent financial documents should be no more than 28 days old.  That includes pay slips, bank statements and the letter of employment.

All other documents should be as up to date as possible.