如何使用Python的datetime模块确定当前时间是否在指定范围内？

Question

什么是最好的方式来看看当前时间是否介于说10:30 AM和... 之间4:30 PM.

我能想到以下几点,不确定如何正确:

from datetime import datetime
nw = datetime.now()
hrs = nw.hour;mins = nw.minute;secs = nw.second;
zero = timedelta(seconds = secs+mins*60+hrs*3600)
st = nw - zero # this take me to 0 hours. 
time1 = st + timedelta(seconds=10*3600+30*60) # this gives 10:30 AM
time2 = st + timedelta(seconds=16*3600+30*60)  # this gives 4:30 PM
if nw>= time1 or nw <= time2:
    print "yes, within the interval"

请告诉我,如果这是正确的方法,可以写出更好的东西吗？

Answer 1

我的原始答案非常专注于所提出的问题,并且不适应跨越午夜的时间范围.因为这仍然是6年后接受的答案,我已经将@ ruble的答案纳入了我的扩展,以支持午夜.

from datetime import datetime, time

def is_time_between(begin_time, end_time, check_time=None):
    # If check time is not given, default to current UTC time
    check_time = check_time or datetime.utcnow().time()
    if begin_time < end_time:
        return check_time >= begin_time and check_time <= end_time
    else: # crosses midnight
        return check_time >= begin_time or check_time <= end_time

# Original test case from OP
is_time_between(time(10,30), time(16,30))

# Test case when range crosses midnight
is_time_between(time(22,0), time(4,00))

我仍然坚持下面我原来的评论,这个逻辑的大多数应用可能更适合于datetime过夜午夜反映为日期变化的对象.

Answer 2

已接受的解决方案不适用于夜间:

def isNowInTimePeriod(startTime, endTime, nowTime):
    if startTime < endTime:
        return nowTime >= startTime and nowTime <= endTime
    else: #Over midnight
        return nowTime >= startTime or nowTime <= endTime

Answer 3

我的 2 美分，它对我有用，而且很简单

while True:
    now = datetime.now()
    current_time = now.strftime("%H:%M:%S")
    start = '19:19:00'
    end = '19:19:20'
    if current_time > start and current_time < end:
        print('in')
        print(current_time)
        tempo.sleep(1)
    else:
        print('out')
        print(current_time)

Answer 4

这是@rouble答案的小例子：

from datetime import datetime

def isNowInTimePeriod(startTime, endTime, nowTime):
    if startTime < endTime:
        return nowTime >= startTime and nowTime <= endTime
    else: #Over midnight
        return nowTime >= startTime or nowTime <= endTime


timeStart = '3:00PM'
timeEnd = '11:00AM'
timeNow = '2:59AM'
timeEnd = datetime.strptime(timeEnd, "%I:%M%p")
timeStart = datetime.strptime(timeStart, "%I:%M%p")
timeNow = datetime.strptime(timeNow, "%I:%M%p")

print(isNowInTimePeriod(timeStart, timeEnd, timeNow))