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# 將字符串轉化為時間類型d4 = datetime.datetime.strptime(date,'%Y-%m-%d %H:%M:%S.%f')print d4

# -*- coding:utf-8 -*-import datetimedef 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-8import 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tz，設置時區類型。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結構"""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"""轉成字符串詳細規則見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")