datetime处理日期和时间

from datetime import datetime
#获取当前时间

print('获取当前时间')

print(datetime.now())
#获取当前标准时间

print('获取当前标准时间')
print(
datetime.utcnow())

#用指定日期时间创建datetime
now=datetime(2017,5,23,12,20)
print(now)

from datetime import datetime

print('将以下字符串转换成datetime类型：')
print(datetime.strptime('2017/9/30','%Y/%m/%d'))
print(datetime.strptime('2017年9月30日星期六','%Y年%m月%d日星期六'))
print(datetime.strptime('2017年9月30日星期六8时42分24秒','%Y年%m月%d日星期六%I时%M分%S秒'))
print(datetime.strptime('9/30/2017','%m/%d/%Y'))
print(datetime.strptime('9/30/2017 8:42:50','%m/%d/%Y %H:%M:%S'))

from datetime import datetime
print('将以下datetime类型转换成字符串：')
print(
datetime(2017,9,28,10,3,43))
a=datetime(2017,9,28,10,3,43)
print(a.strftime('%Y年%m月%d日%A,%H时%M分%S秒'))
b=datetime(2017,9,30,9,22,17)
print(b.strftime('%A,%B %d, %Y'))
print(b.strftime('%m/%d/%Y %I:%M:%S %p'))
print(b.strftime('%B %d,%Y'))

from datetime import datetime
now=datetime(2017,9,28)
print(now.strftime('今天是%Y年%m月%d日'))
print(now.strftime('今天是这周的第%w天'))
print(now.strftime('今天是今年的第%j天'))
print(now.strftime('今周是今年的第%W周'))
print(now.strftime('今天是当月的第%d天'))