From May to July, we bask in the sun from seven to nine in the morning and four to six in the afternoon. Sunbathing in May-July can be from 7: 00 am to 9: 00 am and from 4: 00 pm to 6: 00 pm, which is the best time to sunbathe in summer, which can make people produce vitamin D and promote the absorption of calcium. So from May to July, we bask in the sun from 7 am to 9 am and from 4 pm to 6 pm.