Pay day for many people does not fall on the last day of the month; it would therefore be helpful when producing reports for the start and end dates to use the "pay month".

Also here in the UK, the financial year (for income tax purposes) ends on the 5th April, so the ability to specify the accounting period as running from 6th April one year through to 5th April the following year would be a benefit to those of us who have to provide income tax data to HMRC.