"The date of Coming into Force" means the date of ratification of the Contract by the competent authorities of both parties, whichever comes later.

“生效日期”是指由双方当事人，以时间在后者为准主管机关批准的合同的日期。

youdao

Many workers are wary of the new contract, which is up for ratification beginning this weekend, but others recognize the market has changed.

NPR: Lower Costs in UAW Contract Seen as Key for GM