But how to distinguish between empty entry and a value of midnight? 

In my case i have a form with start1, end1 and start2 and end2:
   if start2 exists.
      end2 cannot be empty
   if start1 and end1 and start 2 exist:
      end2 cannot be smaller then start2, except if value 0:00 is inserted

Hope it is clear

On Friday, October 14, 2016 at 1:40:42 PM UTC+2, Anthony wrote:
> It does not behave as None but as False (so you can actually test to see 
> if it is None). For details, see https://bugs.python.org/issue13936. At 
> the end of that issue discussion, you will not it was closed with a commit 
> that changed the behavior in Python 3.5 (in 3.5, time(0, 0) evaluates to 
> True). If you are trying to determine if the relevant value is None, just 
> test for that explicitly:
> if time_or_none is not None:
>     do_something_with(time_or_none)
> Anthony
> On Friday, October 14, 2016 at 5:07:16 AM UTC-4, Yebach wrote:
>> Hello
>> I have a datetime field in db. If I set time to 0:00  - datetime.time(0, 
>> 0) the if statement behaves as variable is None
>> Any ideas why?

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