Calculate the amount of days between two dates in sqlite

I have a query who works fine in oracle sql and give me the amount of days between 'er.rental_end_date' and 'er.rental_start_date'.
I need it to work on sqlite, but there I always get a '0', plus the '1' that I add in the query, then I always get one.
Can someone help please.
Thank you.

select er.*,p.user_def_num1 power_consumption,
(cast(er.rental_end_date-er.rental_start_date as decimal)+1) rental_days,
(cast(er.rental_end_date-er.rental_start_date as decimal)+1) * 24 * p.user_def_num1 total_power
from c_equipment_rental er, product p
where er.product_id = p.product_id and er.request_id = '{0}'
Alain BensimonAsked:
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NorieAnalyst Assistant Commented:
Have you tried the juliandate function?

juliandate(er.rental_end_date) - juliandate(er.rental_start_date)
Alain BensimonAuthor Commented:
Yes, I did not work.
NorieAnalyst Assistant Commented:
How did it not work?

What data type are the fields rental_end_date and rental_start_date?
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Pawan KumarDatabase ExpertCommented:
Please try this -


SELECT julianday(er.rental_end_date) - julianday(er.rental_start_date) FROM YourTableName

or this

SELECT strftime('%d',er.rental_end_date) - strftime('%d',er.rental_start_date) FROM YourTableName

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NorieAnalyst Assistant Commented:
Oops, didn't notice my typo - of course it should be julianday not juliandate.
Alain BensimonAuthor Commented:
julianday worked well.
Thank everyone
Pawan KumarDatabase ExpertCommented:
Welcome. Glad to help as always.
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