将pandas系列中的时间戳数据转换为datetime

Question

我可以轻松地将时间戳转换为日期时间：

>>> time = pd.Timestamp('2016-02-05 00:02:00')
Timestamp('2016-02-05 00:02:00')
>>> time.to_datetime()
datetime.datetime(2016, 2, 5, 0, 2)

但出于某种原因，当我尝试将其应用于整个系列时，值不会改变类型：

>>> time = pd.Series([pd.Timestamp('2016-02-05 00:02:00'), pd.Timestamp('2016-02-05 00:03:00'), pd.Timestamp('2016-02-05 00:04:00')])
0   2016-02-05 00:02:00
1   2016-02-05 00:03:00
2   2016-02-05 00:04:00
dtype: datetime64[ns]
>>> time.apply(lambda x: x.to_datetime())
0   2016-02-05 00:02:00
1   2016-02-05 00:03:00
2   2016-02-05 00:04:00
dtype: datetime64[ns]

如何将整个系列转换为日期时间？