how to show date time duration in asp net c#

Question

I have an employee in my website,and i have start date and end date in my database.Now, how to show time duration for example

EMPLOYEE
Madhu Gadhe(total period 4 Years 2014-2018)
Start Date: 12/6/2014 9:00 AM
he worked 6 months 18 days 12 hours 30 minutes 30 seconds
remaining 3 years 6 months 18 days 12 hours 30 minutes 30 seconds

i want to show like this