Bug #12833
Updated by jonwolski (Jon Wolski) about 8 years ago
## Expected `DateTime.iso8601('2016-10')` expected: DateTime.iso8601('2016-10') parses the input string as four-digit year and two-digit month. ## Actual `DateTime.iso8601('2016-10')` actual: DateTime.iso8601('2016-10') parses the input string as four-digit year and two-digit day-of-month. ## Steps steps to reproduce reproduce: ```sh $ ruby -v -r date -e "puts DateTime.iso8601('2016-10').iso8601" ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15] 2016-01-10T00:00:00+00:00 ``` ## More details ```sh Here's some more background: $ ruby -r date -e "puts Date._iso8601('2016-10')" {:mday=>10, :year=>2016} $ ruby -r date -e "puts Date._iso8601('2016-101')" {:yday=>101, :year=>2016} ``` This seems to suggest that the "10" is parsed as day-of-month (`:mday`) in the case of "YYYY-DD", but "101" is parsed as day-of-year (`:yday`) in the case of "YYYY-DDD". (The 3-digit day part _does_ in fact represent the day-of-year; that feature is correct.)