Github user yu-iskw commented on the pull request:
https://github.com/apache/spark/pull/8264#issuecomment-132218883
@rxin it seems that `from_unixtime` and `unix_timestamp` depends on the
default time zone setting.
I'm working at JST (UTC+9), but the Jenkins is at PDT(UTC-7). So those
errors as follows might occur because of the time difference.
At least, we can''t set a time zone of `from_unixtime` and
`unix_timestamp`. Is that OK?
For example, `from_unixtime(1000)`
- JST(UTC+9) => "1970-01-01 09:16:40"
- PDT(UTC-7) => "1969-12-31 16:16:40"
### Jenkins Ouput
```
1. Failure (at test_sparkSQL.R#797): date functions on a DataFrame
-------------
collect(select(df2, unix_timestamp(lit("2015-01-01"), "yyyy-MM-dd")))[1, 1]
not equal to 1420038000
1.42e+09 - 1.42e+09 == -61200
2. Failure (at test_sparkSQL.R#802): date functions on a DataFrame
-------------
collect(select(df3, from_unixtime(df3$a)))[, 1] not equal to c("1970-01-01
09:16:40", "1970-01-01 08:43:20")
2 string mismatches:
x[1]: "1970-01-01 09:16:40"
y[1]: "1969-12-31 16:16:40"
x[2]: "1970-01-01 08:43:20"
y[2]: "1969-12-31 15:43:20"
```
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