get the first day of a week as a date in r

You can use the lubridate package to get the first day of a week as a date in R. The floor_date function can be used to round a given date down to the nearest specified time unit, which can be set to "week". Here's an example code:

main.r
library(lubridate)

# Create a sample date
date <- as.Date("2021-05-19")

# Get the first day of the week
first_day <- floor_date(date, unit = "week")

# Print the result
print(first_day)
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This code will output the first day of the week containing the input date, which in this example is "2021-05-16". You can change the input date and check that the first_day variable gets updated accordingly.