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I insert a time value using the following code

 

 

$ti= ( !empty($_POST['time']) ) ? "'{$_POST['time']}'" : 'NULL'; 

 

I want to insert a second time value into a differen column which would be the same time minus 1 hour

 

something along the lines of :

 

$ti2= ( !empty($_POST['time']) ) ? "'{$_POST['time'] -1 hour}'" : 'NULL'; 

 

What would be the correct way to do it

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https://forums.phpfreaks.com/topic/294032-insert-time-minus-one-hour/
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In my original I have

Insert into table1 (time) values ($ti);

which works correctly (no quotes round $ti)

 

I have put 

insert into table1 (time, time2) values ($ti, $ti - interval 1 hour );

But it doesn't work, NULL is inserted into time2 not time minus 1 hour

 

Any ideas , thanks.

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