常用时间转换及处理函数：

import datetime# 获取当前时间d1 = datetime.datetime.now()print d1# 当前时间加上半小时d2 = d1 + datetime.timedelta(hours=0.5)print d2# 格式化字符串输出d3 = d2.strftime('%Y-%m-%d %H:%M:%S')print d3# 将字符串转化为时间类型d4 = datetime.datetime.strptime(date,'%Y-%m-%d %H:%M:%S.%f')print d4

获取本周和本月第一天的日期：

# -*- coding:utf-8 -*-import datetimedef first_day_of_month(): ''' 获取本月第一天 :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(): ''' 获取本周第一天 :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的功能强大能支持0001年到9999年""""""当前时间返回的是一个datetime类型now方法有个参数tz，设置时区类型。如果没有和方法today的效果一样"""now = datetime.datetime.now()#UTC时间datetime.datetime.utcnow()attrs = [("year","年"),('month',"月"),("day","日"),('hour',"小时"),( '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)"""返回一个time结构"""now.timetuple() """返回一个date类型"""now.date()"""返回一个time类型"""now.time()"""当前星期几。星期一是0，星期于是6注意这里是方法，不是属性哦。"""now.weekday()"""当前星期几。星期一是1，星期于是7注意这里是方法，不是属性哦。"""now.isoweekday()"""修改当前时间。比如修改成当月1号"""now.replace(day=1)past = datetime.datetime(2010,11,12,13,14,15,16)"""进行比较运算返回的是timedelta类型"""now-past"""转成字符串详细规则见Time篇"""strdatetime = now.strftime("%Y-%m-%d %H:%M:%S")"""字符串生成datetime对象"""datetime.datetime.strptime(strdatetime, "%Y-%m-%d %H:%M:%S")

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