Github user tarekauel commented on the pull request:
https://github.com/apache/spark/pull/6981#issuecomment-116502627
The tests fail because Hive calculates for the May, 6 2011 18 as week
number, Java `Locale.US` 19.
The reason is a different definition of week 1 (see [The definition of Week
of Year is local dependent.](http://stackoverflow.com/a/4608695/3532525)).
```
scala> new java.text.SimpleDateFormat("w", java.util.Locale.US).format(new
java.text.SimpleDateFormat("dd-MM-yyyy",
java.util.Locale.US).parse("06-05-2011"))
res16: String = 19
```
```
scala> new java.text.SimpleDateFormat("w",
java.util.Locale.GERMANY).format(new java.text.SimpleDateFormat("dd-MM-yyyy",
java.util.Locale.GERMANY).parse("06-05-2011"))
res15: String = 18
```
@Davies It seems to be that the `SimpleDateFormat` ignores that the default
Timezone has been set in `beforeAll` of `HiveCompatibilitySuite`. Shall I add
`WeekOfYear` to the whitelist?
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