as from/of sth starting from a particular time or date and continu 自某一时间[日期]起： As from today, you are in charge of the office. 从今天起，你来负责这个办公室。/ As of now, there will be no more paid overtime.从现在起不再有加班费。（摘自《朗文当代高级英语辞典》第六版 as ）

As from today, you are in charge of the office. 

这个不能写成下面这个句子：

As you are in charge of the office from today, you are in charge of the office.