Datetime comparison PHP/Mysql?

Question

I\'m trying to make something like this:

if (datetime - system date > 15 minutes) (false)

if (datetime - system date          


        

Answer 1

If your dates are already in MySQL you will want to do the comparison in the query because:

1. MySQL has proper DATE types.
2. MySQL has indexes for comparison.
3. MySQL performs comparisons much faster than PHP.
4. If you filter your data in the query then less, or no time is spent transferring superfluous data back to the application.

Below is the most efficient form. If there is an index on the date column it will be used.

SELECT *
FROM table
WHERE date > DATE_SUB(NOW(), INTERVAL 15 MINUTE)

Docs: DATE_SUB()

If you need to do it in PHP:

$now = time();
$target = strtotime($date_from_db);
$diff = $now - $target;
if ( $diff > 900 ) {
  // something
}

or, more succinctly:

if( time() - strtotime($date_from_db) > 900 ) {
  // something
}