now that

not so(as)...as<-->no matter(what, when, where, how)

now that
now that 既然
Now that I am free, I can enjoy music for a while.
既然有空，我可以享受一下音乐。
I am broke now that it's just before payday.
刚好在发薪日前我已一文不名。
The days are closing in now that autumn is here.
秋天来到了，白天渐渐短了。
The days are drawing out now that it's spring.春
天到来，白昼越来越长了。
She is much more mobile now that she has a car.
她现在出去方便多了，她有了一辆汽车。

详解：

now that相当于做连词的since，意为：既然；since做连词时还有：因为；自从的意思。如：
He must have taken the book since it isn't here.
他一定是把书拿走了,因为书已不在这里了。
Since you can't answer the question, perhaps we'd better ask someone else.
既然你无法回答这个问题，我们最好再问问别人。
He had spoken to her only once since the party.
自从那次聚会以来,他只跟她说过一次话。

not so(as)...as<-->no matter(what, when, where, how)