python datetime时间格式的相互转换问题

具体代码如下所示：

# 时间的替换import time,datetimetoday = datetime.datetime.today()print(’当前时间：’,today)print(’当前时间转换成整h整m整s:’,today.replace(minute=0, second=0))# 时间的加减res1 = today + datetime.timedelta(days=1,minutes=60)print(’增加的时间为res:’,res1)res0 = datetime.datetime.now()print(’未格式化时间res0：’,res0)# 将时间转字符串格式化res2 = datetime.datetime.now().strftime('%Y/%m/%d')print(’格式化后的时间res:’,res2)# 字符串转时间res3 = datetime.datetime.strptime(’2018/10/11’, '%Y/%m/%d')print(’字符串转特定的时间res：’,res3) # 转成时间元组print(’转成时间元组:’,today.timetuple())#日期0000时间格式转换为普通时间格式str_time =’2018-12-14 00:00:00’start_date = datetime.datetime.strptime(str_time, '%Y-%m-%d %H:%M:%S')print(’start_date:’,start_date)print(’---------第二部分----------’)from datetime import datetimefrom datetime import timedelta# 1) 获取当前日期和时间today = datetime.today() # 返回当前时间时分秒都为0print(’当前today:’,today)today1 = datetime.now() # 返回当前日期和时间# now.hour # 时# now.minute # 分# now.isoweekday（）# 返回的1-7代表周一--周日；# now.weekday（）# 返回的0-6代表周一--到周日# 而标准格式种%w 1-6表示周一--周六，0代表周日print(’today1’, today1 )today2 = datetime.utcnow() # 返回当前东八区时间就是比当时时间少8个小时print(’today2:’,today2)# 2) 获取指定日期和时间,加减计算time= datetime(2019, 5, 12, 12, 13, 14)d= time + timedelta(weeks=0, days=0, hours=0, minutes=0, seconds=0, milliseconds=0, microseconds=0, )#依次为 '周' '天', '时','分','秒','毫秒','微秒'print(’time:’,time)print(’d:’,d)time1= '2019-5-12 12:13:14'# 字符串 日期d1 = datetime.strptime(str(time1),’%Y-%m-%d %H:%M:%S’)plus= d1 + timedelta(days=1)# 加minus = d1 - timedelta(days=1)# 减print(’d1:’,d1)print(’plus:’,plus)print(’minus:’,minus)time2= 20190512121314d2 = datetime.strptime(str(time2),’%Y%m%d%H%M%S’)delta = d2 + timedelta(days=1)print(’time2:’,time2)print(’d2:’,d2 )print(’delta:’,delta)# 3) 日期datetime-timestamp 时间戳相互转now_stamp = time.timestamp()print(’指定时间对应时间戳 :’, now_stamp)print(’对应本地时间 :’, datetime.fromtimestamp(now_stamp ))print(’UTC标准时间 :’, datetime.utcfromtimestamp(now_stamp ))print(’本周的第几天:’, datetime.fromtimestamp(now_stamp ).weekday())# 4) datetime 时间 转换为str字符串now = datetime.now()print(’当前时间的的:’, now)print(’转换为str字符串:’,now.strftime(’%Y%m%d%H%M%S’))print(’--------第三部分-------------’)import datetimefrom datetime import timedeltanow = datetime.datetime.now()print(’now:’,now)# 今天today = nowprint(’today:’,today)# 昨天yesterday = now - timedelta(days=1)print(’yesterday:’,yesterday)# 明天tomorrow = now + timedelta(days=1)print(’tomorrow:’,tomorrow)# 当前季度now_quarter = now.month / 3 if now.month % 3 == 0 else now.month / 3 + 1print(’now_quarter:’,now_quarter)# 本周第一天和最后一天this_week_start = now - timedelta(days=now.weekday())this_week_end = now + timedelta(days=6 - now.weekday())print(’this_week_start:’,this_week_start)print(’this_week_end:’,this_week_end)# 上周第一天和最后一天last_week_start = now - timedelta(days=now.weekday() + 7)last_week_end = now - timedelta(days=now.weekday() + 1)print(’last_week_start:’,last_week_start)print(’last_week_end:’,last_week_end)# 本月第一天和最后一天this_month_start = datetime.datetime(now.year, now.month, 1)month = now.month + 1if month == 13: month = 1 year = now.year + 1 this_month_end = datetime.datetime(now.year + 1, 1, 1) - timedelta(days=1) print(’this_month_end:’,this_month_end )else: this_month_end = datetime.datetime(now.year, now.month + 1, 1) - timedelta(days=1) print(’this_month_end:’,this_month_end )# 上月第一天和最后一天last_month_end = this_month_start - timedelta(days=1)last_month_start = datetime.datetime(last_month_end.year, last_month_end.month, 1)print(’last_month_end:’,last_month_end)print(’last_month_start:’,last_month_start)# 本季第一天和最后一天month = (now.month - 1) - (now.month - 1) % 3 + 1this_quarter_start = datetime.datetime(now.year, month, 1)this_quarter_end = datetime.datetime(now.year, month + 3, 1) - timedelta(days=1)print(’this_quarter_start:’,this_quarter_start)print(’this_quarter_end:’,this_quarter_end)# 上季第一天和最后一天last_quarter_end = this_quarter_start - timedelta(days=1)last_quarter_start = datetime.datetime(last_quarter_end.year, last_quarter_end.month - 2, 1)print(’last_quarter_end:’,last_quarter_end)print(’last_quarter_start:’,last_quarter_start)# 本年第一天和最后一天this_year_start = datetime.datetime(now.year, 1, 1)this_year_end = datetime.datetime(now.year + 1, 1, 1) - timedelta(days=1)print(’this_year_start:’,this_year_start)print(’this_year_end:’,this_year_end)# 去年第一天和最后一天last_year_end = this_year_start - timedelta(days=1)last_year_start = datetime.datetime(last_year_end.year, 1, 1)print(’last_year_end:’,last_year_end)print(’last_year_start:’,last_year_start)

打印结果如下：

总结

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