任何民事法律关系的产生、变更、消灭都含有时间效力关系,并受到时间效力的约束。经济合同法关于经济合同依法成立,即具有法律约束力的规定,就包括时效的约束力。当事人必须在合同约定的时间期限以内全面履行合同约定的义务。逾期履行义务是违约,要承担违约责任。经济合同时间效力,按合同运行的不同阶段,可概述为四个方面。 The birth, change and elimination of any civil legal relations contain the relationship of time and force, and are bound by the effect of time. Economic contract law on the establishment of the economic contract according to law, that is, legally binding provisions, including the statutory binding. The parties must fully perform the obligations stipulated in the contract within the time limit stipulated in the contract. Late performance of the obligation is a breach of contract, to assume liability for breach of contract. The effectiveness of economic contract time, according to different stages of operation of the contract, can be summarized in four areas.