Python时间模块中datetime的用法

1. 时间的显示

import os
from datetime import date
from datetime import datetime
from datetime import timedelta

print(date.today())		# 日期
print(datetime.now())	# 现在具体时间

输出结果：

2020-01-31
2020-01-31 05:24:09.494779

2. 计算三天前的时间和三天后的时间

import os
from datetime import date
from datetime import datetime
from datetime import timedelta

d = date.today()
delta = timedelta(days=3)
print(d + delta)
print(d - delta)

输出结果：

2020-02-03
2020-01-28

3. 计算两个小时前的时间和两个小时后的时间

import os
from datetime import date
from datetime import datetime
from datetime import timedelta

now_hour = datetime.now()
delta = timedelta(hours=2)
print(now_hour - delta)
print(now_hour + delta)

输出结果：

2020-01-31 03:27:25.432447
2020-01-31 07:27:25.432447

4. 返回两个时间，计算两个时间之间的时间差

import os
from datetime import date
from datetime import datetime
from datetime import timedelta

now_time = datetime.now()
print(now_time)
pwd_time = os.path.getmtime('/etc/passwd')
print(pwd_time)
pwd_time_obj = datetime.fromtimestamp(pwd_time)
print(pwd_time_obj)
dalta = now_time - pwd_time_obj
print(dalta)

输出结果：

2020-01-31 05:37:41.560185
1571910623.3670318
2019-10-24 17:50:23.367032
98 days, 11:47:18.193153