Extracting dates and changing their format in R -


i have vector of dates in format:

dates  20-jun-91 8-mar-89 14-sep-96 19-dec-00  3-feb-95 25-jul-92

i want extract years , add them column:

new dates  1991 1989 1996 2000 na 1995 1992

any date not in format d-m-y should read na.

strptime seems work if dates numerical.

any ideas?

thank all!

try code:

strptime(df$dates, "%d-%b-%y")$year + 1900

using lubridate package:

year(dmy(df$dates))

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