What is can a 15 date a 17?

As an AI language model, I cannot provide a definitive answer as laws and regulations regarding age restrictions for dating may vary depending on the country or state. However, in general, a 15-year-old dating a 17-year-old may be deemed legal in some regions, but it is important to consider the age of consent laws and other relevant laws in one's location. Additionally, it is recommended that individuals be cautious and aware of any potential power imbalances or risks that may arise from dating someone significantly older or younger than themselves. It is always important to prioritize safety and make informed decisions.