R中如何将读入的CSV格式日期，变为日期格式

我有一个CSV文件，读入R后原来的日期变成了因子格式如“2013-10-15”，怎么把它转化为R认可的日期格式，谢谢了

Use "strptime" function: suppose your variable is named "dt", the following cmd will give you the date in the format recognized by R:

1. strptime(dt, format = "%Y-%m-%d")

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Optionally, you may want to read your data using "stringsAsFactors=FALSE" so that the date will be read as string and when using "strptime" function you can avoid the implicit covert the factor back to string.