attilapiros edited a comment on issue #23000: [SPARK-26002][SQL] Fix day of year calculation for Julian calendar days URL: https://github.com/apache/spark/pull/23000#issuecomment-448098882 @cloud-fan It was off by one (at least at 1500, with each 100 years back in time the difference increases) as I described in the [Jira](https://issues.apache.org/jira/browse/SPARK-26002): ``` +-----------------------------------+ |dayofyear(CAST(1500-01-02 AS DATE))| +-----------------------------------+ | 1| +-----------------------------------+ scala> sql("select year('1500-01-01')").show() +------------------------------+ |year(CAST(1500-01-01 AS DATE))| +------------------------------+ | 1499| +------------------------------+ scala> sql("select month('1500-01-01')").show() +-------------------------------+ |month(CAST(1500-01-01 AS DATE))| +-------------------------------+ | 12| +-------------------------------+ scala> sql("select dayOfYear('1500-01-01')").show() +-----------------------------------+ |dayofyear(CAST(1500-01-01 AS DATE))| +-----------------------------------+ | 365| +-----------------------------------+ ```
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