This issue was solved with changeset r33414.
Shane, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.
time.c (Init_Time): Improve Time documentation. Patch by Shane
Emmons. [Ruby 1.9 - Bug #5404]
lib/time.rb: Improve time.rb documentation including Time.strptime.
Patch by Shane Emmons. [Ruby 1.9 - Bug #5402]