Week of the year and weekday according to ISO 8601

This is an substitute for the %V and %u formats which are not implemented on Windows. In addition, the package offers functions to convert from standard calender format yyyy-mm-dd to and from ISO 8601 week format yyyy-Www-d.


ISOweek 0.6-2


  • Fixed problems when package "lubridate" is loaded. lubridate overrides + and - methods for POSIXt, Date and difftime

ISOweek 0.6-1


  • Minor corrections to the documentation

  • Added one more example to ISOweek2date()

  • Moved internal functions to separate file, added keyword internal

  • Corrected email address of maintainer

ISOweek 0.6.0


  • Added the functions date2ISOweek() and ISOweek2date()

ISOweek 0.5


  • Code was restructured and rewritten. Comments and variable names were translated from German to English.

  • Documentation added to R sources using roxygen2

  • Test cases added for use by test_that

Reference manual

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0.6-2 by Uwe Block, 10 years ago

Browse source code at https://github.com/cran/ISOweek

Authors: Uwe Block <[email protected]> , using an algorithm by Hatto von Hatzfeld <[email protected]>

Documentation:   PDF Manual  

GPL (>= 2) license

Imports stringr

Suggests testthat

Imported by matman, sentometrics.

Depended on by EpiCurve.

See at CRAN