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find if today is a recurring day

Posted on 2015-01-19
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Last Modified: 2015-01-19
Hi:

Let's say on 10/10/2014 I have created a recurring task. It recurs on every 10 days.
How can I understand if today there is a recurring task?

Thank you.
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Question by:myyis
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 40557683
step 1: number of days between schedule start and today, using datediff
http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_datediff

step 2: use the modulo function to see if the remainder of the division (datediff ...) and the (10 days) divisor gives 0 or not:
http://dev.mysql.com/doc/refman/5.0/en/mathematical-functions.html#function_mod
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Author Comment

by:myyis
ID: 40557708
I see that it will be difficult for me to go over the steps. You make me super happy if you write the  query,
thank you very much.
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Accepted Solution

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Guy Hengel [angelIII / a3] earned 500 total points
ID: 40557723
let's consider this table:
create table test(d date);
insert into test values('2014-10-10');
insert into test values('2014-10-11');
insert into test values('2014-10-12');
insert into test values('2014-10-13');

Open in new window


then, this query
select d
, datediff(now(), d)
, mod(datediff(now(), d), 10) 
from test;

Open in new window

:

returns this data:
 	DATEDIFF(NOW(), D) 	MOD(DATEDIFF(NOW(), D), 10)
October, 10 2014 00:00:00+0000 	101 	1
October, 11 2014 00:00:00+0000 	100 	0
October, 12 2014 00:00:00+0000 	99 	9
October, 13 2014 00:00:00+0000 	98 	8

Open in new window


where only 2014-10-11 has a remainder of 0, so that one, as start date, would mean that today is a recurring 10 day interval date, or for 2014-10-10, yesterday would have been such a date.
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Author Comment

by:myyis
ID: 40557903
thank you
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Author Comment

by:myyis
ID: 40558686
Hi Guy,
Can you have a look at this?
http://www.experts-exchange.com/Database/MySQL/Q_28599434.html#a40558061
Thank you.
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