“I work inside all day in front of a computer, do I really need to an SPF in my daily skin care routine?”
One word answer: YES.
Do you commute to and from work when the sun is shining? Do you leave your office for lunch or to grab coffee? Do you have a window in your office?
You are exposed to UVA and UVB rays even when you aren’t actively in the sun.
Here in San Francisco weather can be unpredictable. I once got a mild sunburn on the back of my neck while eating lunch in Union Square.