大小比较代码：
1 import datetime
2 import time
3 #将日期字符串转为时间再比较，time，datetime,str
4 def valid_date(timestr):
5 #获取当前时间日期
6 nowTime_str = datetime.datetime.now().strftime('%Y-%m-%d')
7 print(nowTime_str)
8 #mktime参数为struc_time,将日期转化为秒，
9 e_time = time.mktime(time.strptime(nowTime_str,"%Y-%m-%d"))
10 print(e_time)
11 try:
12 s_time = time.mktime(time.strptime(timestr, '%Y-%m-%d'))
13 print(s_time)
14 #日期转化为int比较
15 diff = int(s_time)-int(e_time)
16 print(diff)
17 if diff >= 0:
18 return 1
19 else:
20 print('所查日期不能小于当前时间！！！')
21 return 0
22 except Exception as e:
23 print(e)
24 return 0
25 if __name__=='__main__':
26 valid_date("2018-10-07")
解决报错方案：
1 Traceback (most recent call last):
2 File "E:/pycharm/WorkPlace/Graduation_project/Util/有用插件/日期比较.py", line 32, in <module>
3 nowTime_str = datetime.datetime.now().strftime('%Y年%m月%d日')
4 UnicodeEncodeError: 'locale' codec can't encode character '\u5e74' in position 2: encoding error
更改为：
1 time.strftime('%Y{y}%m{m}%d{d} %H{h}%M{f}%S{s}').format(y='年',m='月',d='日',h='时',f='分',s='秒')
