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how to return the date with only the day in it in r

format(as.Date(df$x,format="%Y-%m-%d"), format = "%d")

# or

format(df_meas$Time, format= %d")
# where df_meas$Time is of as.POSIXlt class 
Comment

r get date from year and day

> strptime(paste("1976", 53), format="%Y %j")
[1] "1976-02-22"
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