It is reported, TRON will launch virtual machine on May 25 (UTC+8), mainnet on May 31, token migration on June 21 and the first 27 super representative elections on June 26. With this date approaching, today, HitBTC announced that it would support the TRON blockchain upgrade and token migration. Investors only need to deposit TRX’s ERC-20 tokens to HitBTC before June 24th in 2018 (UTC+8) and will receive the equivalent TRX token after mainnet launch. No transaction is affected during the migration.
HitBTC is the world’s most advanced cryptocurrency exchange. Since 2013, HitBTC has been providing markets for Bitcoin, Ethereum, Litecoin, Dogecoin, Monero, USDT, and more than 300 cryptocurrencies in total. Created by outstanding technical minds, high-level finance professionals and experienced traders, HitBTC is delivering the most reliable, fast and powerful platform solution on the market.

Here is what you should know about TRX migration: https://medium.com/tron-foundation/guide-to-independence-trx-token-migration-269302b6655c