Week numbers in Ruby
To get the current ISO 8601 week number in Ruby, use the following code snippet:
require "date"
puts Date.today.cweek
* Ensure your system or application regional settings are set to follow ISO 8601 standards (weeks start on Monday) if the output varies.
Instructions étape par étape
- Require the date library: require "date".
- Call Date.today.cweek for the ISO week number.
- Use Date.today.cwyear for the matching ISO year.
Bon à savoir
cweek/cwyear are the ISO 8601 pair. Date#strftime("%V") gives the same week number as a zero-padded string; avoid %U and %W, which use different week-start rules.