Question

请英语大神帮忙翻译个句子，是某合同上面的最后一句话，不胜感激不胜感激！

In witness whereof the parties hereto have caused this Agreement tobe executed and delivered by their proper officers duly authorised as of the date first beforewritten.

Answer 1

本协议相关各方已于下述日期正式签署本协议，特此为证。

Answer 2

本协议相关各方已签署本协议，由其相应官员正式授权后自上书时间起生效，特此为证。