Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/7589#discussion_r35724424
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -573,4 +573,109 @@ object DateTimeUtils {
dayInYear - 334
}
}
+
+ /**
+ * Returns the date value for the first day of the given month.
+ * The month is expressed in months since 1.1.1970, starting from 0.
+ */
+ def getDaysFromMonths(months: Int): Int = {
+ val yearSinceEpoch = if (months < 0) months / 12 - 1 else months / 12
+ val monthInYearFromZero = months - yearSinceEpoch * 12
+ val daysFromYears = getDaysFromYears(yearSinceEpoch)
+ val febDays = if (isLeapYear(1970 + yearSinceEpoch)) 29 else 28
+ val daysForMonths = Seq(31, febDays, 31, 30, 31, 30, 31, 31, 30, 31,
30, 31)
--- End diff --
when you are updating this pr, you could reuse
`private[this] val daysInNormalYear` in this object.
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