How to get week numbers from dates?

by

Base package

Using the function strftime passing the argument %V to obtain the week of the year as decimal number (01–53) as defined in ISO 8601. (More details in the documentarion: ?strftime)

strftime(c("2014-03-16", "2014-03-17","2014-03-18", "2014-01-01"), format = "%V")

Output:

[1] "11" "12" "12" "01"

More Related Contents:

  1. data.table objects assigned with := from within function not printed
  2. Looping over a Date or POSIXct object results in a numeric iterator
  3. .EACHI in data.table?
  4. Use a value from the previous row in an R data.table calculation
  5. Faster way to read fixed-width files
  6. Melt using patterns when variable names contain string information – avoid coercion to numeric
  7. Error: package or namespace load failed for ggplot2 and for data.table
  8. How to perform join over date ranges using data.table?
  9. Is there a more elegant way to convert two-digit years to four-digit years with lubridate?
  10. Split text string in a data.table columns
  11. Split date into different columns for year, month and day
  12. Update subset of data.table based on join
  13. Select values from different columns based on a variable containing column names [duplicate]
  14. Converting Date formats in R [closed]
  15. knitr gets tricked by data.table `:=` assignment
  16. Add multiple columns to R data.table in one function call?
  17. Checking if Date is Between two Dates in R
  18. R: How to get the Week number of the month
  19. data.table merge based on date ranges
  20. Reason behind speed of fread in data.table package in R
  21. data.table row-wise sum, mean, min, max like dplyr?
  22. Subset data.frame by date
  23. := (pass by reference) operator in the data.table package modifies another data table object simultaneously
  24. Rowwise cumulative sum
  25. How to select R data.table rows based on substring match (a la SQL like)
  26. Any way to force fread() of data.table not to stop on empty lines?
  27. R data table: update join
  28. Convert two-digit years to four-digit years with correct century
  29. Split a string column into several dummy variables
  30. R fast single item lookup from list vs data.table vs hash

Leave a Comment