Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20015#discussion_r157926055
--- Diff: python/pyspark/sql/functions.py ---
@@ -1111,6 +1111,24 @@ def trunc(date, format):
return Column(sc._jvm.functions.trunc(_to_java_column(date), format))
+@since(2.3)
+def date_trunc(format, timestamp):
+ """
+ Returns timestamp truncated to the unit specified by the format.
+
+ :param format: 'year', 'yyyy', 'yy', 'month', 'mon', 'mm',
+ 'day', 'dd', 'hour', 'minute', 'second', 'week', 'quarter'
+
+ >>> df = spark.createDataFrame([('1997-02-28 05:02:11',)], ['d'])
--- End diff --
`d` -> `t` or `ts`.
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