Issue #14317 has been reported by jbake (Julien Bake).

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Bug #14317: Date.strptime(..., "%U") fails if  first day of the week is not in the 0th week.
https://bugs.ruby-lang.org/issues/14317

* Author: jbake (Julien Bake)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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Date.new(2018,1,1)
=> Mon, 01 Jan 2018

Date.new(2018,1,1).strftime("%U %Y")
=> "00 2018"

Date.strptime("00 2018", "%U %Y")
ArgumentError: invalid date

 Date.strptime("1 0 2018", "%u %U %Y")
=> Mon, 01 Jan 2018

i would expect to get the first valid date that is in the 0th week (1.1.2018) from Date.strptime("00 2018", "%U %Y") even if the first day (sunday) of the 0th week is not existing / in the last year.



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