在熊貓數據框中將整數轉換為日期時間

Question

我使用pd.to_numeric (df['dates'], downcast = 'integer')將 datetime64 轉換為 int64 但如果我想將其轉換回日期時間格式，我該怎么辦？ 早些時候它的格式是：2020-02-19 但轉換后現在是 1582070400000000000。我找不到將它恢復到 datetime64 的方法。

Answer 1

Pandas to_datatime 可以解決問題

見示例：

import pandas as pd
# Example DataFrame
df = pd.DataFrame({'dates' : pd.date_range('01-01-2021','01-10-2021',freq='D')})
# To numeric, as you did
df['numeric'] = pd.to_numeric (df['dates'] , downcast = 'integer')
# Back to date
df['back_do_date'] = pd.to_datetime( df['numeric'] )

給出數據幀：df

    dates       numeric             back_do_date
0   2021-01-01  1609459200000000000 2021-01-01
1   2021-01-02  1609545600000000000 2021-01-02
2   2021-01-03  1609632000000000000 2021-01-03
3   2021-01-04  1609718400000000000 2021-01-04
4   2021-01-05  1609804800000000000 2021-01-05
5   2021-01-06  1609891200000000000 2021-01-06
6   2021-01-07  1609977600000000000 2021-01-07
7   2021-01-08  1610064000000000000 2021-01-08
8   2021-01-09  1610150400000000000 2021-01-09
9   2021-01-10  1610236800000000000 2021-01-10