Thank you very much for the help and for the explanations.

Waw! It is so complicated at first! I hope I shall understand these soon.

Finally I decide to use this query:
SELECT Keltezes FROM Orak WHERE Keltezes >= date('now','localtime')
ORDER BY Keltezes LIMIT 1;

At last this works on my Gentoo linux system here, on my laptop.
I used datefudge to give a fake date to the sqlite3.
When I run the above mentioned query without 'localtime', it gives the
right date!
But, when I run the same query with 'localtime', then I get the localtime.

Because I think an Android operating system also uses localtime, I am
going to try out this query now.

2018-04-12 18:48 GMT+02:00 Keith Medcalf <>:
> The Query Planner should decide in the case of the MIN containing query that 
> the best solution is to traverse TheDate in order and return the first hit.  
> This may entail the creation of the necessary index if it does not exist and 
> so the two plans should be more or less identical.
> However, if used in a subquery, the inclusion of the LIMIT may preclude 
> flattening whereas the MIN function version will not preclude flattening.  
> Since the most likely alternative to flattening is a co-routine it probably 
> would not make much of a difference.
> ---
> The fact that there's a Highway to Hell but only a Stairway to Heaven says a 
> lot about anticipated traffic volume.
>>-----Original Message-----
>>From: sqlite-users [mailto:sqlite-users-
>>] On Behalf Of Simon Slavin
>>Sent: Thursday, 12 April, 2018 10:24
>>To: SQLite mailing list
>>Subject: Re: [sqlite] SELECT with CASE
>>On 12 Apr 2018, at 5:16pm, R Smith <> wrote:
>>> SELECT MIN(TheDate)             -- get the smallest date
>>>   FROM Orak                     -- from the table with School-days
>>>  WHERE TheDate >= date('now')   -- where the school-day is later or
>>equal to today.
>>> ;
>>This reflects exactly the right structure for the data.  The
>>following may be a little faster:
>>  SELECT TheDate
>>    FROM Orak
>>   WHERE TheDate >= date('now')
>>ORDER BY TheDate
>>   LIMIT 1
>>Both the above queries will perform far faster if there is an index
>>on the "TheDate" column in Orak.  I'm not quite sure how your data is
>>organised but this may perform another job too if it is a UNIQUE
>>sqlite-users mailing list
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