python 时间转换

  1 def getDateTime(time_str):
  2     ‘‘‘
  3     转换时间
  4     :param time_str:
  5     :return:
  6     ‘‘‘
  7     if not isinstance(time_str,unicode):
  8         time_str = time_str.decode(‘utf-8‘)
  9
 10     time_now = datetime.datetime.now()
 11     time_return = time_str
 12
 13     if u‘秒‘ in time_str:
 14         reg = r‘(\d+)‘
 15         t_second = re.search(reg, time_str)
 16         if t_second is not None:
 17             t_second = t_second.group(1)
 18             t_second = string.atoi(t_second)
 19             t_second = datetime.timedelta(seconds=t_second)
 20             time_return = time_now - t_second
 21             time_return = datetime.datetime.strftime(time_return, ‘%Y-%m-%d %H:%M:%S‘)
 22             return time_return
 23     elif u‘分钟‘ in time_str:
 24         reg = r‘(\d+)‘
 25         t_minute = re.search(reg, time_str)
 26         if t_minute is not None:
 27             t_minute = t_minute.group(1)
 28             t_minute = string.atoi(t_minute)
 29             t_minute = datetime.timedelta(minutes=t_minute)
 30             time_return = time_now - t_minute
 31             time_return = datetime.datetime.strftime(time_return, ‘%Y-%m-%d %H:%M:%S‘)
 32             return time_return
 33     elif u‘小时‘ in time_str:
 34         reg = r‘(\d+)‘
 35         t_hour = re.search(reg, time_str)
 36         if t_hour is not None:
 37             t_hour = t_hour.group(1)
 38             t_hour = string.atoi(t_hour)
 39             t_hour = datetime.timedelta(hours=t_hour)
 40             time_return = time_now - t_hour
 41             time_return = datetime.datetime.strftime(time_return, ‘%Y-%m-%d %H:%M:%S‘)
 42             return time_return
 43     elif u‘今天‘ in time_str:
 44         time_return = time_now.strftime(‘%Y-%m-%d %H:%M:%S‘)
 45         return time_return
 46     elif u‘天前‘ in time_str:
 47         reg = r‘(\d+)‘
 48         t_day = re.search(reg, time_str)
 49         if t_day is not None:
 50             t_day = t_day.group(1)
 51             t_day = string.atoi(t_day)
 52             t_day = datetime.timedelta(days=t_day)
 53             time_return = time_now - t_day
 54             time_return = datetime.datetime.strftime(time_return, ‘%Y-%m-%d %H:%M:%S‘)
 55             return time_return
 56     elif u‘周‘ in time_str:
 57         reg = u‘(\d+)‘
 58         t_week = re.search(reg, time_str)
 59         if t_week is not None:
 60             t_week = t_week.group(1)
 61             t_week = string.atoi(t_week)
 62             t_week = datetime.timedelta(weeks=t_week)
 63             time_return = time_now - t_week
 64             time_return = datetime.datetime.strftime(time_return, ‘%Y-%m-%d %H:%M:%S‘)
 65             return time_return
 66     elif u‘月‘ in time_str:
 67         reg = r‘(\d+)‘
 68         t_num = re.search(reg, time_str)
 69         if t_num is not None:
 70             t_num = int(t_num.group(1))
 71             date_to = time_now.month - t_num
 72             # 判断是否跨年
 73             if date_to == 0:
 74                 month_to = 12
 75                 year_to = -1
 76             else:
 77                 month_to = date_to % 12
 78                 year_to = (date_to) / 12
 79             # 如果是最后一天31日，注意其他月份没有31日
 80             now_year = time_now.year+year_to
 81             d = calendar.monthrange(now_year,month_to)
 82             now_day = time_now.day
 83             if now_day > d[1]:
 84                 now_day = d[1]
 85             date_from = datetime.datetime(now_year,month_to,now_day,time_now.hour,time_now.minute,time_now.second)
 86             time_return = datetime.datetime.strftime(date_from, ‘%Y-%m-%d %H:%M:%S‘)
 87             return time_return
 88     elif u‘年‘ in time_str:
 89         reg = u‘(\d+)‘
 90         t_year = re.search(reg, time_str)
 91         if t_year is not None:
 92             t_year = int(t_year.group(1))
 93             date_from = datetime.datetime(time_now.year-t_year,time_now.month,time_now.day,time_now.hour,time_now.minute,time_now.second)
 94             time_return = datetime.datetime.strftime(date_from, ‘%Y-%m-%d %H:%M:%S‘)
 95             return time_return
 96     else:
 97         # time_return = time_str
 98         int_year = time_now.year
 99         str_year = str(int_year)
100         if time_str.find(str_year) < 0:
101             time_return = str_year + ‘-‘ + time_str
102         t_count = time_str.count(‘:‘)
103         if t_count == 1:
104             time_return += ‘:00‘
105         elif t_count == 0:
106             time_return += ‘ 00:00:00‘
107
108         # 如果日期大于当前日期，则年份减1
109         r_date = datetime.datetime.strptime(time_return, ‘%Y-%m-%d %H:%M:%S‘)
110         if r_date > time_now:
111             int_year_1 = int_year - 1
112             time_return = time_return.replace(str_year, str(int_year_1))
113
114         return time_return
115
116 if __name__ == ‘__main__‘:
117     print getDateTime(‘1周前‘)