获取午夜到当前时间的随机时间

Question

我试图获得午夜和当前时间之间的随机时间（以秒为单位）。

实施例

12:01 AM -> 10:15 AM今天是04/02/2016

def random_date(start, end):
    delta = end - start
    int_delta = (delta.days * 24 * 60 * 60) + delta.seconds
    random_second = randrange(int_delta)
    return start + timedelta(seconds=random_second)

start = datetime.datetime.strptime('2016-04-02 12:00:00', '%Y-%m-%d %H:%M:%S')
end = datetime.datetime.strptime(strftime('%Y-%m-%d %H:%M:%S', gmtime()), '%Y-%m-%d %H:%M:%S')
print random_date(start, end)

结果

python new_visitor.py 
2016-04-02 04:49:54
──[/Applications/MAMP/htdocs/code/python] 
└── python new_visitor.py 
2016-04-02 09:06:15
──[/Applications/MAMP/htdocs/code/python] 
└── python new_visitor.py 
2016-04-02 08:59:22
──[/Applications/MAMP/htdocs/code/python] 
└── python new_visitor.py 
2016-04-02 **12:36:38**
──[/Applications/MAMP/htdocs/code/python] 
└── python new_visitor.py 
2016-04-02 02:38:54

现在的时间是10:22 AM;我过了当前时间。

Answer 1

获取当前时间，在午夜减去当前日期以获得timedelta给出秒数，使用random.randrange()获取新偏移并在{{{{{{{ 1}}再次：

timedelta

演示：

from datetime import datetime, time, timedelta
import random

now = datetime.now()
midnight = datetime.combine(now.date(), time.min)
delta = int((now - midnight).total_seconds())
random_dt = midnight + timedelta(seconds=random.randrange(delta))

Answer 2

以下是对@Martijn Pieters' answer的修改，以避免在DST过渡期间产生偏差或不存在时间：

#!/usr/bin/env python
from datetime import datetime, timedelta
from random import randrange
from tzlocal import get_localzone  # $ pip install tzlocal

local_timezone = get_localzone()
now = datetime.now(local_timezone)
today = datetime(now.year, now.month, now.day)
midnight = local_timezone.normalize(local_timezone.localize(today, is_dst=False))
max_seconds = int((now - midnight).total_seconds())
random_time = midnight + timedelta(seconds=randrange(max_seconds))

如果午夜有DST转换，

is_dst=False用于避免歧义。