2
t1 <- strptime("2015-02-17 12:20:00", format = "%Y-%m-%d %H:%M:%S", tz = "America/Chicago")
t2 <- strptime("2015-03-13 15:00:00", format = "%Y-%m-%d %H:%M:%S", tz = "America/Chicago")
as.numeric(abs(difftime(t1, t2, units = "mins", tz = "America/Chicago")))
上面的函數返回34,660,而Excel和http://www.timeanddate.com/date/duration.html都返回34,720。由於15/3/15的夏令時,R將t1認定爲CST,將t2認定爲CDT。我想確認R是正確的,而這兩個來源不是。R中的difftime與excel和timeanddate.com不同的結果