Github user JonZeolla commented on the issue:
https://github.com/apache/metron/pull/692
Also, I did notice a couple of things when poking around that probably fit
best into some new JIRAs that I at least wanted to mention here:
* It's somewhat unintuitive that we count [starting at zero for
MONTH()](https://github.com/apache/metron/tree/master/metron-stellar/stellar-common#month),
unlike WEEK_OF_MONTH, WEEK_OF_YEAR, DAY_OF_MONTH, and DAY_OF_WEEK.
* We don't comply with [ISO
8601](https://en.wikipedia.org/wiki/ISO_8601#Week_dates) regarding the first
day of the week (We use Sunday, ISO says Monday)
```
[Stellar]>>> MONTH()
7
[Stellar]>>> MONTH(1502664380)
7
[Stellar]>>> WEEK_OF_MONTH(1502664380)
3
[Stellar]>>> DAY_OF_MONTH(1502664380)
13
[Stellar]>>> WEEK_OF_YEAR(1502664380)
33
[Stellar]>>> DAY_OF_WEEK(1502664380)
1
```
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