MySQL: How do I search by timestamp but convert timezone first? - php

Question

I need to be able to get the total amount spent either monthly or daily. To do that I do sum(tblaccounts.amountin) but the issue i'm having is I need to convert my date column to a different timezone fist. I've tried messing with convert_tz(date,"+00:00","+10:00") but not sure how to use it with LIKE.
How can I get records for monthly or daily based on the $period variable while first converting the timestamp?
Something like WHERE convert_tz(date) LIKE $date_to_check%
function check_limit($period='monthlylimit') {
if ($period == 'monthlylimit') {
$date_to_check = date("Y-m");
}
else { ### Day period
$date_to_check = date("Y-m-d");
}
$select = "SELECT
sum(tblaccounts.amountin) as amountin
FROM tblaccounts
WHERE date LIKE '" . $date_to_check . "%'";
}

Answer 1

Utilizing the timezone change inside mysql, this should work out:
if ($period == 'monthlylimit') {
$date = date('Ym');
$format = '%Y%m';
} else {
$date = date('Ymd');
$format = '%Y%m%d';
}
$sql = "SELECT SUM(t.amountin) as amountin FROM tblaccounts t WHERE
DATE_FORMAT(CONVERT_TZ(t.date,'+00:00','+10:00'),'". $format ."') = '". $date ."'";
The correct timezone numbers, will depend on what you have mysql defaulted too, and your desired result. You may have to twiddle with that number.
Or you can change the timezone for the date on php's side and skip mysql tz converting:
$dt = new DateTime("now", new DateTimeZone($tz));// $tz to equal what you are aiming for
$dt->setTimestamp(time());// might not be needed
if ($period == 'monthlylimit') {
$date = $dt->format('Ym');
$format = '%Y%m';
} else {
$date = $dt->format('Ymd');
$format = '%Y%m%d';
}
$sql = "SELECT SUM(t.amountin) as amountin FROM tblaccounts t WHERE
DATE_FORMAT(t.date,'". $format ."') = '". $date ."'";
Note: I did not use LIKE here, as that is why I introduced DATE_FORMAT to set it to a single value to compare on.