How about something like this?
df <- data.frame(ID=1:3, DTVAL=c("2009-03-21","2010-05-11","2020-05-05"))
df <- df %>% mutate(YEAR = as.numeric(format(as.Date(DTVAL,'%Y-%m-%d'),
'%Y')))
-----Original Message-----
From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Charles Thuo
Sent: Friday, June 05, 2020 12:18 AM
To: r-help@r-project.org
Subject: [R] how to add a calculated column into a data frame
Dear Sirs,
I have a data frame that has a column that shows the transaction date.
How do i add another column that extracts the year of transaction from the
transaction date.
Charles
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