如何在Python以毫秒为单位使用 strptime

Python的strptime()函数将字符串转换为 DateTime 对象。 strptime() 是一个类方法，它接受两个参数：

• 应转换为日期时间对象的字符串
• 格式字符串用来解析字符串。

这两个字符串参数对于将字符串转换为 DateTime 对象是必需的。

句法：

strptime(date_string, format_string)

格式代码列表：

Format string	Interpretation	Example
%a	Weekday as an abbreviated name.	Sun, Mon, …, Sat
%A	Weekday as full name.	Sunday, Monday, …, Saturday
%w	Weekday as a decimal number, 0 is Sunday and 6 is Saturday.	0, 1, …, 6
%d	Day of the month as a zero-padded decimal number.	01, 02, …, 31
%b	Month as an abbreviated name.	Jan, Feb, …, Dec
%B	Month.	January, February, …, December
%m	Month	01, 02, …, 12
%y	Year without century.	00, 01, …, 99
%Y	Year with century.	0001, 0002, …, 2013, 2014, …, 9998, 9999
%H	Hour (24-hour clock).	00, 01, …, 23
%I	Hour (12-hour clock).	01, 02, …, 12
%p	either AM or PM.	AM, PM
%M	Minute.	00, 01, …, 59
%S	Second.	00, 01, …, 59
%f	Microsecond as a decimal number.	000000, 000001, …, 999999
%z	UTC offset in the form ±HHMM[SS[.ffffff]] .	+0000, -0400, +1030, +063415, -030712.345216
%Z	Time zone (UTC, GMT)
%j	Day of the year.	001, 002, …, 366
%U	Week number of the year (Sunday as the first day of the week).	00, 01, …, 53
%W	Week number of the year (Monday as the first day of the week) as a decimal number.	00, 01, …, 53
%c	preferred date and time representation.	Tue Aug 16 21:30:00 1998
%x	preferred date representation.	08/16/88 08/16/1998
%X	preferred time representation.	21:30:00 %% – A literal ‘%’ character.

要使用此函数在Python生成毫秒 %f 用于格式代码。

下面给出了一些实现。

示例 1：以毫秒为单位的时间

Python3

from datetime import datetime
  
datetime_string = "15/06/2021 13:30:15.120"
  
print(type(datetime_string))
  
format = "%d/%m/%Y %H:%M:%S.%f"
  
# converting datetime string to datetime 
# object with milliseconds..
date_object = datetime.strptime(datetime_string, format)
  
print("date_object =", date_object)
  
# Type is datetime object
print(type(date_object))

输出：

date_object = 2021-06-15 13:30:15.120000

示例 2：以毫秒为单位的时间

蟒蛇3

from datetime import datetime
  
# Getting current datetime and converting
# it to string
date_str = str(datetime.now())
  
print(type(date_str))
  
print(datetime.strptime(date_str, '%Y-%m-%d %H:%M:%S.%f'))

输出：

2021-08-01 15:27:59.979673

示例 3：以毫秒为单位的时间

蟒蛇3

from datetime import datetime
  
# Using strptime() with milliseconds
  
date_time = datetime.strptime(
    "17 Oct 2021 15:48:35.525001", "%d %b %Y %H:%M:%S.%f")
  
print(date_time)

输出：

2021-10-17 15:48:35.525001