import os
import time
input_time = input('请输入关机时间，格式如：小时:分钟 ：')

if input_time == 'off':
  os.system('shutdown -a')

h1 = int(input_time[0:2])
m1 = int(input_time[3:5])

print(h1, m1)
mytime = time.strftime('%H:%M:%S')
h2 = int(mytime[0:2])
m2 = int(mytime[3:5])

if h1 > 24:
  h1 = 24
  m2 = 0
if m1 > 60:
  m1 = 60
if h1 < h2:
  h1 = h1 + 24

s1 = (h1+(m1/60.0)-h2-(m2/60.0))*3600
if s1 <= 0:
  print("ERROR")
else:
  print('距离关机还有 %d 秒' %s1)
  os.system('shutdown -s -t %d' %s1)