如何将以下字符串转换为datetime对象?
"Jun 1 2005 1:33PM"
如何将以下字符串转换为datetime对象?
"Jun 1 2005 1:33PM"
当前回答
如果您不想明确指定字符串相对于日期时间格式的格式,可以使用此黑客绕过该步骤:
from dateutil.parser import parse
# Function that'll guess the format and convert it into the python datetime format
def update_event(start_datetime=None, end_datetime=None, description=None):
if start_datetime is not None:
new_start_time = parse(start_datetime)
return new_start_time
# Sample input dates in different formats
d = ['06/07/2021 06:40:23.277000', '06/07/2021 06:40', '06/07/2021']
new = [update_event(i) for i in d]
for date in new:
print(date)
# Sample output dates in Python datetime object
# 2014-04-23 00:00:00
# 2013-04-24 00:00:00
# 2014-04-25 00:00:00
如果要将其转换为其他日期时间格式,只需使用您喜欢的格式修改最后一行,例如date.strftime(“%Y/%m/%d%H:%m:%S.%f”):
from dateutil.parser import parse
def update_event(start_datetime=None, end_datetime=None, description=None):
if start_datetime is not None:
new_start_time = parse(start_datetime)
return new_start_time
# Sample input dates in different formats
d = ['06/07/2021 06:40:23.277000', '06/07/2021 06:40', '06/07/2021']
# Passing the dates one by one through the function
new = [update_event(i) for i in d]
for date in new:
print(date.strftime('%Y/%m/%d %H:%M:%S.%f'))
# Sample output dates in required Python datetime object
# 2021/06/07 06:40:23.277000
# 2021/06/07 06:40:00.000000
# 2021/06/07 00:00:00.000000
尝试运行上面的代码段以获得更好的清晰度。
其他回答
Django时区感知日期时间对象示例。
import datetime
from django.utils.timezone import get_current_timezone
tz = get_current_timezone()
format = '%b %d %Y %I:%M%p'
date_object = datetime.datetime.strptime('Jun 1 2005 1:33PM', format)
date_obj = tz.localize(date_object)
当USE_TZ=True时,这种转换对于Django和Python非常重要:
RuntimeWarning: DateTimeField MyModel.created received a naive datetime (2016-03-04 00:00:00) while time zone support is active.
创建一个小的实用程序函数,如:
def date(datestr="", format="%Y-%m-%d"):
from datetime import datetime
if not datestr:
return datetime.today().date()
return datetime.strptime(datestr, format).date()
这是足够多功能的:
如果不传递任何参数,它将返回今天的日期。有一个日期格式作为默认值,您可以覆盖它。您可以轻松地修改它以返回日期时间。
将yyyy-mm-dd日期字符串映射到datetime.date对象的简短示例:
from datetime import date
date_from_yyyy_mm_dd = lambda δ : date(*[int(_) for _ in δ.split('-')])
date_object = date_from_yyyy_mm_dd('2021-02-15')
datetime.strptime将用户指定格式的输入字符串解析为时区原始日期时间对象:
>>> from datetime import datetime
>>> datetime.strptime('Jun 1 2005 1:33PM', '%b %d %Y %I:%M%p')
datetime.datetime(2005, 6, 1, 13, 33)
要使用现有的datetime对象获取日期对象,请使用.date()对其进行转换:
>>> datetime.strptime('Jun 1 2005', '%b %d %Y').date()
date(2005, 6, 1)
链接:
strptime文档:Python 2、Python 3strptime/strftime格式字符串文档:Python 2,Python 3strftime.org格式字符串备忘单
笔记:
strptime=“字符串解析时间”strftime=“字符串格式时间”
In [34]: import datetime
In [35]: _now = datetime.datetime.now()
In [36]: _now
Out[36]: datetime.datetime(2016, 1, 19, 9, 47, 0, 432000)
In [37]: print _now
2016-01-19 09:47:00.432000
In [38]: _parsed = datetime.datetime.strptime(str(_now),"%Y-%m-%d %H:%M:%S.%f")
In [39]: _parsed
Out[39]: datetime.datetime(2016, 1, 19, 9, 47, 0, 432000)
In [40]: assert _now == _parsed