How do return days,week no,month and year in between two dates

Hi Forum Leader,

How do return Day,Week No,Month and Year in between two days. Every time i have calculated manually all of thing.

Start Date End Date Results(Days,Week No,Month,Year)

09/08/2016 25/10/2016 77 Days,11 Weeks,Month 2,0 Year

15/04/2016 26/10/2016 11 Days,----------,6 Months,6 Years.

01/01/2015 31/12/2015 365 Days,52 Weeks,12 Months,1 years.

Please help me.