Legal analysis: the date of signing the contract is wrong, and the parties can negotiate to change it. A contract signed on the wrong date is valid as long as it has the effective elements stipulated by law.

Legal basis: Article 143 of the Civil Law A civil juristic act that meets the following conditions is valid:

(1) The actor has corresponding capacity for civil conduct;

(2) the meaning is true;

(three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.