Effective. If the parties conclude a contract in the form of a contract, it may be established in the form of signatures or seals of both parties; There is no date on the contract, which only shows that the contract is flawed, but the contract may still be effective. Legal basis:

Article 493 of the Civil Code of People's Republic of China (PRC), if the parties conclude a contract in the form of a contract, the place where the contract is concluded is the place where the parties finally sign, seal or fingerprint, unless otherwise agreed by the parties.