import datetime
# 獲取當前時間
d1 = datetime.datetime.now()
print d1
# 當前時間加上半小時
d2 = d1 + datetime.timedelta(hours=0.5)
print d2
# 格式化字符串輸出
d3 = d2.strftime('%Y-%m-%d %H:%M:%S')
print d3
# 將字符串轉(zhuǎn)化為時間類型
d4 = datetime.datetime.strptime(date,'%Y-%m-%d %H:%M:%S.%f')
print d4

# -*- coding:utf-8 -*-
import datetime
def first_day_of_month():
  '''
  獲取本月第一天
  :return:
  '''
  # now_date = datetime.datetime.now()
  # return (now_date + datetime.timedelta(days=-now_date.day + 1)).replace(hour=0, minute=0, second=0,
  # microsecond=0)
  return datetime.date.today() - datetime.timedelta(days=datetime.datetime.now().day - 1)
def first_day_of_week():
  '''
  獲取本周第一天
  :return:
  '''
  return datetime.date.today() - datetime.timedelta(days=datetime.date.today().weekday())
if __name__ == "__main__":
  this_week = first_day_of_week()
  last_week = this_week - datetime.timedelta(days=7)
  this_month = first_day_of_month()
  last_month = this_month - datetime.timedelta(days=(this_month - datetime.timedelta(days=1)).day)
  print this_week
  print last_week
  print this_month
  print last_month

#! /usr/bin/python
# coding=utf-8

import datetime

"""
datetime的功能強大
能支持0001年到9999年
"""

"""
當前時間
返回的是一個datetime類型
now方法有個參數(shù)tz，設(shè)置時區(qū)類型。如果沒有和方法today的效果一樣
"""
now = datetime.datetime.now()
#UTC時間
datetime.datetime.utcnow()
attrs = [
("year","年"),('month',"月"),("day","日"),('hour',"小時"),( 'minute',"分"),( 'second',"秒"),( 'microsecond',"毫秒"),(
'min',"最小"),( 'max',"最大"),
]
for k,v in attrs:
  "now.%s = %s #%s" % (k,getattr(now, k),v)


"""
返回一個time結(jié)構(gòu)
"""
now.timetuple() 

"""
返回一個date類型

"""
now.date()

"""
返回一個time類型

"""
now.time()

"""
當前星期幾。星期一是0，星期于是6
注意這里是方法，不是屬性哦。
"""
now.weekday()

"""
當前星期幾。星期一是1，星期于是7
注意這里是方法，不是屬性哦。
"""
now.isoweekday()

"""
修改當前時間。比如修改成當月1號
"""
now.replace(day=1)

past = datetime.datetime(2010,11,12,13,14,15,16)

"""
進行比較運算
返回的是timedelta類型

"""
now-past
"""
轉(zhuǎn)成字符串
詳細規(guī)則見Time篇

"""
strdatetime = now.strftime("%Y-%m-%d %H:%M:%S")
"""
字符串生成datetime對象
"""
datetime.datetime.strptime(strdatetime, "%Y-%m-%d %H:%M:%S")