如何在spark中将一列字符串日期转换为一列unix历元

Question

我是spark和scala的新手，我想将一列字符串日期转换为Unix时期。我的数据帧如下：

+----------+-------+
|   Dates  |Reports|
+----------+-------+
|2020-07-20|     34|
|2020-07-21|     86|
|2020-07-22|    129|
|2020-07-23|     98|
+--------+---------+
The output should be 
+----------+-------+
|   Dates  |Reports|
+----------+-------+
|1595203200|     34|
|1595289600|     86|
|1595376000|    129|
|1595462400|     98|
+--------+---------+
``

Answer 1

使用unix_timestamp。

val df = Seq(("2020-07-20")).toDF("date")
df.show
df.withColumn("unix_time", unix_timestamp('date, "yyyy-MM-dd")).show
+----------+
|      date|
+----------+
|2020-07-20|
+----------+
+----------+----------+
|      date| unix_time|
+----------+----------+
|2020-07-20|1595203200|
+----------+----------+