如何替换文本

有一个字符串"2000.3.3",我想把它换为2000-3-3,再cdate。好像用replace和split都可以,但我照着格式没试出来
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replace("2000.3.3", ".", "-")
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ubound(aaa)返回aa的下标上限
前一个就减一,aaa=aaa(ubound(aaa)-1)

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