另一种方法是在R中使用as.Date/ strftime和其他日期时间操作函数
# create a Date column (can do things with dates as dates now)
dat$Date <- as.Date(as.character(dat$dates),format = '%d/%m/%Y')
# create character column with format of your desire
dat$newDate <- strftime(dat$Date, '%d%m%Y')
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