【python笔记】时间处理

  def datetime_toString(dt):
     return dt.strftime("%Y-%m-%d-%H")

   def string_toDatetime(string):
       return datetime.datetime.strptime(string, "%Y-%m-%d %H:%M:%S")

   d1=datetime.datetime.strptime('2015-09-01 10:00:00',"%Y-%m-%d %H:%M:%S")
   d1+datetime.timedelta(days=-1)

   
   # timedelta 参数 days,hours,seconds

  datetime.now().weekday()  0-6 周一到周日

  datetime.datetime.now()

  select DATE_FORMAT(create_time,'%Y%u') weeks,count(caseid) count from tc_case group by weeks;  
  
  
  select DATE_FORMAT(dtStatTime,'%Y%m%d') days,max(iUserNum),iWorldId from tbRealOnline where iWorldId in (3,11) and dtStatTime>'2015-09-01 00:00:00' group by days,iWorldId;

  <% import datetime %>${ datetime.datetime.now().strftime('%Y-%m-%d %H:%M') } 
  <% import datetime %>${ (datetime.datetime.now()+datetime.timedelta(hours=+5)).strftime('%Y-%m-%d %H:%M') }