(十五) 初遇python甚是喜爱之Datetime Module模块操作

import datetime
import pytz
####datetime.date()学习
t_date = datetime.date(2019,5,21)
print(t_date)#2019-05-21
#这里注意传入的月份、天不能以0开头
#t_date = datetime.date(2019,05,21)
#SyntaxError: invalid token
#print(t_date)
#获取今天的日期
today = datetime.date.today()
print(today)#2019-05-21
print(today.year)#2019
print(today.day)#21
print(today.month)#5

#接下来看weekday()和isoweekday()
print(today.weekday())#1
print(today.isoweekday())#2
#区别：
#weekday() 周一：0 周日：6
#isoweekday() 周一：1 周日：7

#delta两个时间的间隔函数
#定义间隔时间为7天
tdelta = datetime.timedelta(days=7)
#打印当前时间分别加减7天
print(today + tdelta)#2019-05-28
print(today - tdelta)#2019-05-14
#定义生日的日期
birthday = datetime.date(2019,7,12)
today = datetime.date.today()
#获取距离过生日还有多久
till_birthday = birthday - today
print(till_birthday)#52 days, 0:00:00
print(till_birthday.days)#52
print(till_birthday.total_seconds())#4492800.0
####datetime.time()学习
t_time = datetime.time(9,30,45,100000)
#同上这里注意传入的时分秒等开头不能加O
print(t_time)#09:30:45.100000
print(t_time.hour)#9
print(t_time.minute)#30
print(t_time.second)#45
print(t_time.microsecond)#100000
#####datetime.datetime()学习
d_time = datetime.datetime(2019,5,21,14,6,40,100000)
print(d_time)#2019-05-21 14:06:40.100000
print(d_time.date())#2019-05-21
print(d_time.time())#14:06:40.100000
print(d_time.year)#2019
tdelta = datetime.timedelta(days=7)
#加7天
print(d_time + tdelta)
#加12小时
hourdelta = datetime.timedelta(hours=12)
print(d_time + hourdelta)

###TimeZone时区的学习
#下面代码使用到
#pytz 第三方的时区库
#使用pip install pyzt 安装
#pip的使用后续在学
#这里不做描述
#引入pytz 见开头部分
#定义时间  指定时区
d_time = datetime.datetime(2019,5,21,14,6,40,100000,tzinfo =pytz.UTC)
print(d_time)
#定义时间now()指定时区
d_time_now = datetime.datetime.now(pytz.UTC)
print(d_time_now)
#定义时间utcnow()指定时区
d_time_utcnow = datetime.datetime.utcnow().replace(tzinfo=pytz.UTC)
print(d_time_utcnow)
#改变时区
d_time_now = datetime.datetime.now(pytz.UTC)
d_time_sh = d_time_now.astimezone(pytz.timezone('Asia/Shanghai'))
print(d_time_sh)
#打印所有的时区
#for tz in pytz.all_timezones:
#  print(tz)

#定义时间 时区指定为亚洲上海
d_time_now = datetime.datetime.now(tz = pytz.timezone('Asia/Shanghai'))
#打印iso格式的时间
print(d_time_now.isoformat())#2019-05-21T14:46:51.286184+08:00

#String to Datetime字符串转时间
#使用strptime()
dt_str = 'May 21 2019'
dt = datetime.datetime.strptime(dt_str,'%B %d %Y')
print(dt)
#Datetime to String时间转字符串
#使用strftime()
print(d_time_now.strftime('%B %d %Y'))

2019-05-21
2019-05-21
2019
21
5
1
2
2019-05-28
2019-05-14
52 days, 0:00:00
52
4492800.0
09:30:45.100000
9
30
45
100000
2019-05-21 14:06:40.100000
2019-05-21
14:06:40.100000
2019
2019-05-28 14:06:40.100000
2019-05-22 02:06:40.100000
2019-05-21 14:06:40.100000+00:00
2019-05-21 07:16:20.772527+00:00
2019-05-21 07:16:20.772527+00:00
2019-05-21 15:16:20.772527+08:00
2019-05-21T15:16:20.772527+08:00
2019-05-21 00:00:00
May 21 2019