You can use OP_CHECKLOCKTIMEVERIFY to get a transaction into the blockchain now (and confirmed), but unspendable until a certain block in the future. The payment will not be reversible after it is confirmed, and the money becomes unusable until the block in the future, when only the recipient is allowed to spend it. Coinbin has a tool to generate an address that uses OP_CHECKLOCKTIMEVERIFY, but it only supports using one public key. This is different from just creating a transaction and adding a time lock to it. This transaction will be published and confirmed in the blockchain before it can be spent, not after.