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By the time用法可以和when互换么?

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By the time用法可以和when互换么?
两个都能表示“当.”么?
By the time用法可以和when互换么?
y本身有‘.之前’的意思.
by the time是典型的要求完成时态的词组,比如:
By then,he was 15.
那时他已经15岁了.(到那时之前.)
By the time she gets there,they will have covered everything.
她到那里之前,他们就已经掩盖了一切.