Legal analysis: the signing time of the contract is not a necessary clause of the contract, that is to say, not writing the date of the contract will not lead to the invalidity or failure of the contract, but if there is a lawsuit in the future, more evidence will be needed to prove the start and end date of the contract, which increases the difficulty of obtaining evidence. If a contract is concluded in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints.

Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.