Do not get down like this, retrieved before you…

不要这样下去了，找回以前的你…

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The parameters before and since allow you to apply time stamps and limit the data retrieved to only those updates that occurred before or after a specific date.

before和since参数可让您运用时间戳进行限制，只检索某一特定日期之前和之后的数据。

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As you can see, we use the same trick that we used before: retrieved a DataGraph instance from the message using a format string, then replaced the DataGraph on the message.

可以看出，我们使用了与前面相同的诀窍：从使用格式字符串的消息中检索DataGraph，然后替换消息中的DataGraph。

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