How to Change periods Dates/Duration

SUGGESTED

Hi,

As you can see in attached file My first period start  "1-Jan-16" & End on "1 Jan 2016" & my 2nd period start "2 jan to 29 feb 2016"  and so on which is not good in report  please help me out to resolving this issue. Which should be start  "1-jan-2016 to 31 jan 2016" and so on.& my year will end on 31-dec 2016