我目前正在将excel文件另存为"Fin_report.xlsx"，但我也希望将其保存日期纳入其中。它应该类似于："Fin_report-yyyy-mm.xlsx"
其中yyyy-mm是上个月的日期。例如，如果今天是2018-03-01，则今天的文件应保存为："Fin_report-2018-02.xlsx"
答案 0 :(得分：1)
您正在寻找的是改变日期月份并将字符串插入另一个月份的混合物。
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库来表示日期，并编写我自己的函数lubridate，打印出上个月的月份。
last_month()答案 1 :(得分：0)
仅使用基数R，您可以使用Sys.Date()获取计算机上的当前时间。你可以减少＆＃39;使用seq()的酷炫功能一个月，这将给你：
lastmonth <- seq(Sys.Date(), length=2, by="-1 months")[2]
# [1] "2018-02-01"
您只能使用format
format(lastmonth, "%Y-%m")
# [1] "2018-02"
然后您可以使用paste0将字符串格式化为文件名：
filename <- paste0("Fin_report-", format(lastmonth, "%Y-%m"), ".xlsx")
filename
# [1] "Fin_report-2018-02.xlsx"