well i thought the question was for when you are at the beach. i don't think you can spend that much time under the sun everyday in the city. unless if you're job really called for it. don't you think?
Yes, it's official you need sunscreen even for days you think you dont need it. Dermatologists recommend daily usage to reduce risks to skin related cancers also helps slow down ageing process due to sun exposure. So ladies, cover up!