libdatetime-format-strptime-perl 1.6800-1 (amd64 binary) in ubuntu zesty

 DateTime::Format::Strptime implements most of strptime(3), the POSIX
 function that is the reverse of strftime(3), for DateTime. While strftime
 takes a DateTime and a pattern and returns a string, strptime takes
 a string and a pattern and returns the DateTime object
 associated.