The contract takes effect as of October 1.句中的as of 是怎么回事?

The contract takes effect as of October 1.句中的as of 是怎么回事? 英语翻译Charity accused of damaging the environment as it takes such as the greater anxiety of adults or the effect of their 英语外贸合同1：30% of the contract value should be paid as deposit she takes as care of you as herself As is known to all ,the effect of laughter ___physical and m the subject takes only half as large a percentage of the tot besides the water,a plant takes up such parts of the soil as The woman takes good care of the girl as if she___her daught Mr Tang takes a good care of the animals as his pets. (when you eat) has as much of an effect on your mood as (wha THE EFFECT OF CONFIDENCE