Question

我有三种日期格式：YYYY-MM-DD，DD.MM.YYYY，DD/MM/YYYY。

是否可以验证和解析2014-05-18或18.5.2014或18/05/2019等字符串？

Answer 1

尝试每种格式并查看其是否有效：

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')

Answer 2

>>> import dateutil.parser
>>> dateutil.parser.parse(date_string)

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日期格式，你可以随时回到Jon Clements提到的那个。

Answer 3

Pure python：

from datetime import datetime
my_datetime = datetime.strptime('2014-05-18', '%Y-%m-%d') 
repr(my_datetime)

>>> 'datetime.datetime(2014,5,18,0,0)'

检查datetime.strptime（）格式文档以获取更多格式字符串。

Answer 4

这实际上是我面临的一个问题，这是我如何接近它，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 --> ): ")

如何在python中通过多种格式格式化日期字符串

4 个答案: