time

##coding=utf-8
import time
'''
时间戳
localtime  mktime
结构化时间对象
strftime  strptime
格式化时间字符串
'''

# 时间戳 1970.1.1 到当前时间的时间间隔，单位秒
print(time.time())  #1643351022.6102395 获得当前时间戳

# 格式化时间对象
st = time.localtime()
print(st)  # time.struct_time(tm_year=2022, tm_mon=1, tm_mday=28, tm_hour=14, tm_min=26, tm_sec=59, tm_wday=4, tm_yday=28, tm_isdst=0)
print(type(st)) # <class 'time.struct_time'>
# st 本质上是一个元组，一共9个元素
print(f'今天是{st[0]}-{st[1]}-{st[2]}')
print('今天是{}-{:02d}-{}'.format(st[0], st[1], st[2]))
print('今天是 星期{}'.format(st.tm_wday + 1))
# 对象是可读的

# 格式化的时间字符串

print(time.ctime())

# strftime(时间格式) ‘%Y-%m-%d %H:%M:%S’
print(time.strftime('%Y-%m-%d %H:%M:%S %a %b'))

# sleep
t1 = time.time()
print('sleep begin..')
time.sleep(1.23)
print('sleep end')
t2 = time.time()
print('执行了{:.3f}秒'.format(t2 - t1))

# 三种格式之间的转换
# 时间戳 -> 结构化对象
# UTC 零时区的时间
print(time.gmtime(),'xxxxxxxx')
print(time.gmtime(time.time() - 3600))

print(time.localtime())
print(time.localtime(time.time() - 3600))

# 结构化对象 ->时间戳
# mktime(st)
print(time.time())
print(time.mktime(time.localtime()))

# 结构化对象 -> 格式化时间字符串
print(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime()))

# 格式化字符串 -> 结构化时间对象
# strptime(str, format)
strtime = '2022-01-28 18:13:53'
print(time.strptime(strtime, '%Y-%m-%d %H:%M:%S'))

1652628141.2076697
time.struct_time(tm_year=2022, tm_mon=5, tm_mday=15, tm_hour=23, tm_min=22, tm_sec=21, tm_wday=6, tm_yday=135, tm_isdst=0)
<class 'time.struct_time'>
今天是2022-5-15
今天是2022-05-15
今天是 星期7
Sun May 15 23:22:21 2022
2022-05-15 23:22:21 Sun May
sleep begin..
sleep end
执行了1.234秒
time.struct_time(tm_year=2022, tm_mon=5, tm_mday=15, tm_hour=15, tm_min=22, tm_sec=22, tm_wday=6, tm_yday=135, tm_isdst=0) xxxxxxxx
time.struct_time(tm_year=2022, tm_mon=5, tm_mday=15, tm_hour=14, tm_min=22, tm_sec=22, tm_wday=6, tm_yday=135, tm_isdst=0)
time.struct_time(tm_year=2022, tm_mon=5, tm_mday=15, tm_hour=23, tm_min=22, tm_sec=22, tm_wday=6, tm_yday=135, tm_isdst=0)
time.struct_time(tm_year=2022, tm_mon=5, tm_mday=15, tm_hour=22, tm_min=22, tm_sec=22, tm_wday=6, tm_yday=135, tm_isdst=0)
1652628142.4416027
1652628142.0
2022-05-15 23:22:22
time.struct_time(tm_year=2022, tm_mon=1, tm_mday=28, tm_hour=18, tm_min=13, tm_sec=53, tm_wday=4, tm_yday=28, tm_isdst=-1)