如何在python中通过多种格式格式化日期字符串
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How to format date string via multiple formats in python
提问by Alexey Sh.
I have three date formats: YYYY-MM-DD, DD.MM.YYYY, DD/MM/YYYY.
我有三种日期格式：YYYY-MM-DD, DD.MM.YYYY, DD/MM/YYYY.
Is it possible to validate and parse strings such as 2014-05-18or 18.5.2014or 18/05/2019?
是否可以验证和解析诸如2014-05-18or18.5.2014或 or 之类的字符串18/05/2019？
采纳答案by Jon Clements
Try each format and see if it works:
尝试每种格式，看看它是否有效：
from datetime import datetime
def try_parsing_date(text):
for fmt in ('%Y-%m-%d', '%d.%m.%Y', '%d/%m/%Y'):
try:
return datetime.strptime(text, fmt)
except ValueError:
pass
raise ValueError('no valid date format found')
回答by Gabriel M
Pure python:
纯蟒蛇：
from datetime import datetime
my_datetime = datetime.strptime('2014-05-18', '%Y-%m-%d')
repr(my_datetime)
>>> 'datetime.datetime(2014,5,18,0,0)'
Check datetime.strptime() format documentation for more format strings.
检查 datetime.strptime() 格式文档以获取更多格式字符串。
回答by khan
>>> import dateutil.parser
>>> dateutil.parser.parse(date_string)
This should take care of most of the standard date formats in Python 2.7+. If you really have super custom date formats, you can always fall back to the one mentioned by Jon Clements.
这应该处理 Python 2.7+ 中的大多数标准日期格式。如果你真的有超级自定义的日期格式，你总是可以回到 Jon Clements 提到的那种。
回答by user3615696
This actually a problem i was facing and this how i approached it, my main purpose was to the date seperators
这实际上是我面临的一个问题以及我如何处理它，我的主要目的是日期分隔符
class InputRequest:
"This class contain all inputs function that will be required in this program. "
def __init__(self, stockTickerName = 'YHOO', stockSite='yahoo', startDate = None,
endDate = datetime.date.today()):
def requestInput(self, requestType =''):
"Fro requesting input from user"
self.__requestInput = input(requestType)
return self.__requestInput
def dateFormat(self, dateType=''):
'''
this function handles user date input
this repeats until the correct format is supplied
dataType: this is the type of date, eg: DOF, Date of Arriveal, etc
'''
while True:
try:
dateString = InputRequest.requestInput(self,dateType)
dtFormat = ('%Y/%m/%d','%Y-%m-%d','%Y.%m.%d','%Y,%m,%d','%Y\%m\%d') #you can add extra formats needed
for i in dtFormat:
try:
return datetime.datetime.strptime(dateString, i).strftime(i)
except ValueError:
pass
except ValueError:
pass
print('\nNo valid date format found. Try again:')
print("Date must be seperated by either [/ - , . \] (eg: 2012/12/31 --> ): ")
