计算两个日期之间的差异

Question

My dates in the txt file are like, start date= "011589" and end date is "122390". How can I calculate the duration using R.

I tried mydata$startdate=as.Date(mydata$startdate) but it did not work

Answer 1

This can be done using format

Start <- as.Date("011589", "%m%d%y")
Start
#[1] "1989-01-15"
End <- as.Date("122390", "%m%d%y")
End
#[1] "1990-12-23"

If we need the difference in 'days'

as.vector(difftime(End, Start, units='days'))
#[1] 707

Or just use - to get the difference in 'days'. The above method is more flexible as we can specify the units

as.vector(End-Start)
#[1] 707