Convert Date to Julian Day in R (3 Examples) | Get Days of Year | as.POSIXlt(), format() or yday()

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R code of this video:

my_date <- as.Date("2023-03-15") # Create example date
my_date # Print example date

my_julian1 <- as.POSIXlt(my_date)$yday # Convert date to Julian day
my_julian1 # Print Julian day

my_julian2 <- format(my_date, "%j") # Convert date to Julian day
my_julian2 # Print Julian day

library("lubridate") # Load lubridate

my_julian3 <- yday(my_date) # Convert date to Julian day
my_julian3 # Print Julian day

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as.POSIXlt function produce output from '0' not from '1' (I have 20 years in my date fram and would like to convert DOY)

surajbhagat