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")))
上面的函数返回34,660,而Excel和http://www.timeanddate.com/date/duration.html都返回34,720。由于15/3/15的夏令时,R将t1认定为CST,将t2认定为CDT。我想确认R是正确的,而这两个来源不是。R中的difftime与excel和timeanddate.com不同的结果