使用AM / PM将python字符串转换为datetime obj [英] Converting python string to datetime obj with AM/PM

问题描述

容易的问题，但这使我烦恼：

easy problem but this is bugging me:

说我有这样的字符串：

test = '2015-08-12 13:07:32'

要将其转换为日期时间对象并将其更改为AM / PM规范，这不应该吗？

To convert it into a datetime object and change it to AM/PM specification, shouldn't this work?

datetime.datetime.strptime(test, '%Y-%m-%d %I:%M:%S %p')

我遇到这样的错误：
ValueError：时间数据'2015-08-12 13:07:32'与格式'％Y-％m不匹配-％d％I：％M：％S％p'

另外，奖励积分：

如果我已经具有日期时间格式的内容，如何从该状态更改它？ （如果我想将其保留为日期时间对象，而只是对其进行重新格式化以使其成为AM / PM）

If I already have something in datetime format, how do I change it from that state? (if I wanted to keep it as a datetime object but just reformat it to make it AM/PM)

推荐答案

datetime.strptime（）用于将字符串转换为datetime对象，当使用 strptime（）时，必须指定正确的

datetime.strptime() is used for converting a string to a datetime object , when using strptime() you have to specify the correct format in which the date/time in the string exists .

在您的情况下，格式应为-'％Y-％m-％d ％H：％M：％S'。

In your case the format should be - '%Y-%m-%d %H:%M:%S' .

示例-

>>> test = '2015-08-12 13:07:32'
>>> import datetime
>>> datetime.datetime.strptime(test, '%Y-%m-%d %H:%M:%S')
datetime.datetime(2015, 8, 12, 13, 7, 32)

---

如果您真正想要的是日期时间作为a带有 AM / PM 的字符串，那么您需要使用 strftime（）将其转换回具有以下格式的字符串您希望在这种情况下，格式为-'％Y-％m-％d％I：％M：％S％p'。示例-

---

If what you really want is the date-time back as a string with the AM/PM , then you need to use strftime() to convert it back to string with the format you want, in this case the format would be - '%Y-%m-%d %I:%M:%S %p' . Example -

>>> datetime.datetime.strptime(test, '%Y-%m-%d %H:%M:%S').strftime('%Y-%m-%d %I:%M:%S %p')
'2015-08-12 01:07:32 PM'

---

datetime 对象内部不存储（也不必存储）AM / PM信息，因为可以从小时轻松计算

---

datetime objects internally do not store (and do not have to store) the AM/PM information, since that can be easily calculated from the hour.

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