解析各种文本的年月日

解析各种文本的年月日

def str2date(str_date):
     str_date=str_date.strip()
     if(len(str_date)>11):
         str_date=str_date[:11]
     if(str_date.find('-')>0):
         year=str_date[:4]
         if(year.isdigit()):
             year=int(year)
         else:
             year=0
         month=str_date[5:str_date.rfind('-')]
         if(month.isdigit()):
             month=int(month)
         else:
             month=0
         if(str_date.find(' ')==-1):
             day=str_date[str_date.rfind('-')+1:]
         else:
             day=str_date[str_date.rfind('-')+1:str_date.find(' ')]
         if(day.isdigit()):
             day=int(day)
         else:
             day=0
     elif(str_date.find('年')>0):
         year=str_date[:4]
         if(year.isdigit()):
             year=int(year)
         else:
             year=0
         month=str_date[5:str_date.rfind('月')]
         if(month.isdigit()):
             month=int(month)
         else:
             month=0
         day=str_date[str_date.rfind('月')+1:str_date.rfind('日')]
         if(day.isdigit()):
             day=int(day)
         else:
             day=0
     elif(str_date.find('/')>0):
         year=str_date[:4]
         if(year.isdigit()):
             year=int(year)
         else:
             year=0
         month=str_date[5:str_date.rfind('/')]
         if(month.isdigit()):
             month=int(month)
         else:
             month=0
         if(str_date.find(' ')==-1):
             day=str_date[str_date.rfind('/')+1:]
         else:
             day=str_date[str_date.rfind('/')+1:str_date.find(' ')]
         if(day.isdigit()):
             day=int(day)
         else:
             day=0
     if month<10:
         month='0'+str(month)
     if day<10:
         day='0'+str(day)
     return '%s-%s-%s' % (year,month,day)