The phrase 'behind times' refers to something or someone that is out of date, outdated, or obsolete. Antonyms for this phrase include up-to-date, modern, contemporary, current, and fashionable. These terms reflect the latest trends, technology, and innovations in various fields, from fashion, design, and music to science, medicine, and business. Being up-to-date and modern implies that one is aware of the latest advancements and embraces change and progress. Conversely, being behind times suggests a lack of knowledge, interest, or willingness to adapt to new circumstances. Thus, using antonyms of the phrase 'behind times' can convey a positive, dynamic, and forward-looking attitude.