A:When will the new regulations come into force?

　　新规定什么时候生效？

　　B:The new regulations will come into force on January 1st.

　　新规定将于1月1日生效。

　　This law will go into effect on the day of its promulgation.

　　本法自公布之日起施行。

　　The common law comes into force next week.

　　习惯法将于下星期生效。

　　The common law goes into effect next week.

　　习惯法将于下星期施行。

　　延伸阅读:

　　A:The law on libel is considered too lenient.

　　反诽谤法被认为太宽大了。

　　B:Why is it considered too lenient?

　　为什么被认为太宽大？

　　The driver is considered very excellent.

　　这个司机被认为很优秀。

　　The contract is considered too troublesome.

　　这个合同被认为太麻烦了。

　　The discussion of tonight is considered too rewarding.

　　今晚的讨论被认为太值得了。