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“It's important to know that vitamin D is not obtained from the sun just anytime, anywhere. So, the rule of thumb is that if the sun is not at least 45 degrees above the horizon you are not going to be able to get any vitamin D because the ozone in the air is thick enough that the UV-B rays don't get to you. So you can still get sunburn from the UV-A rays but the UV-B rays that help provide vitamin D are not accessible to you.

If you want to know if you're getting vitamin D or not it's very simple:

When you're outside, look at the ground; look at your shadow. If your shadow is not sharp and shorter than you are tall, you are not getting significant amounts of vitamin D.”
― Linda Benskin

“Experts on dietetics (the study of diet and its health effects) are finally recognising that balanced vegan diets are healthy. The British Dietary Association has stated well planned vegan diets can support healthy living in people of all ages, and other similar professional bodies all over the world agree. On the other side, the World Health Organization has classified processed meat as carcinogenic, and there is increasing evidence that eating lots of meat and dairy increases blood pressure and blood cholesterol, which leads to heart disease, and that cutting them out can significantly reduce your risk of type 2 diabetes, a disease which is affecting an increasing number of people in developed nations.”
― Jordi Casamitjana, Ethical Vegan: A Personal and Political Journey to Change the World