how can I get my system timezone on my php server - php

Question

My machine has (GMT +6:00 Astana,Dhaka) .I set my time zone on my php script
date_default_timezone_set('Asia/Dhaka');
But some times it shows wrong date in date() function. May be my php server doesn't set GMT time.
But My mysql server catch my machine system timezone. so I need same in php.
Here my database tables outline
SHOP_BALANCE-------------shop_balance_id(PK,AI,INT),shop_balance(DOUBLE),dates(DATE)
PRODUCT_PURCHASE_ITEM----product_purchase_item_id(PK,AI,INT),product_id(INT),
pr_pur_cost_price(DOUBLE),pr_pur_unit_price(DOUBLE),
quantity(INT),product_size(INT),dates(TIMESTAMP),
bool_check(TINYINT)
PRODUCT_PURCHASES--------product_purchase_id(PK,AI,INT),insert_operation(INT),
product_purchase_item_id(FK ref of PRODUCT_PURCHASE_ITEM).
product_id(INT),dates(TIMESTAMP),product_size(INT)
IDEA IS IF DATE MATCH, SHOP BALANCE DECREASING ON THIS DAY. IF DATE IS NEW DATE TO SHOP BALANCE LAST DATE, SHOP BALANCE ALSO DECREASING BUT INSERT NEW DATE
Here my code
Find last row mysql date on shop_balance table. My dates column is date type
$query=$this->db->query("select dates from shop_balance order by dates desc limit 1");
$rowfind_last_stock=$query->row();
if(isset($rowfind_last_stock->dates)){
$find_last_date=$rowfind_stock->dates;
}
Find today date in my php server
$today=date("Y-m-d");
Check date for different query
if($find_last_date==$today){
//run update query
$this->db->query(
"UPDATE
shop_balance AS s
INNER JOIN
(
SELECT p.dates,SUM(pr_pur_cost_price*quantity) AS net
FROM product_purchase_item AS i
LEFT JOIN product_purchases AS p
ON p.product_purchase_item_id=i.product_purchase_item_id
WHERE p.insert_operation='$id'
GROUP BY p.insert_operation
) AS a
ON s.dates=date(a.dates)
SET s.shop_balance=s.shop_balance-a.net
);"
}
else{
//run insert query
$this->db->query(
"INSERT INTO shop_balance
SELECT null,
(
(
SELECT shop_balance
FROM shop_balance
ORDER BY shop_balance_id
DESC LIMIT 1
)
-
(
SELECT p.dates,SUM(pr_pur_cost_price*quantity) AS net
FROM product_purchase_item AS i
LEFT JOIN product_purchases AS p
ON p.product_purchase_item_id=i.product_purchase_item_id
WHERE p.insert_operation='$id'
GROUP BY p.insert_operation
)
),
curdate();"
);
}
The problem is sometimes it perform insert query even same date in php and mysql date when I install different.Both timezone I set above GMT +6.00 . why this problem?

Answer 1

Please refer to the documentation MySQL Server Time Zone Support and for the time_zone and system_time_Zone variables.
I believe you will find that your system time zone setting is not what you expect. When your insert query calls curdate(), MySQL delivers it in the time zone from the session's time_zone variable. By default, this will be the same zone that is set in the system_time_zone variable.
You can check your time zone variables like this:
SHOW VARIABLES LIKE '%time_zone'
If you don't want to change the MySQL server's system time zone, then you can set the session time zone by inserting this before your queries:
SET time_zone = 'Asia/Dhaka';
If you get an error, then the time zone tables haven't been loaded. You can use the mysql_tzinfo_to_sql to populate them. See also this answer.
Of course, a much easier solution would be to not use curdate(), and instead gather the current date from PHP and pass it in to query as a parameter.

Answer 2

Note that since PHP 5.1.0 (when the date/time functions were rewritten), every call to a date/time function will generate a E_NOTICE if the timezone isn't valid, and/or a E_WARNING message if using the system settings or the TZ environment variable.
Instead of using this function to set the default timezone in your script, you can also use the INI setting date.timezone to set the default timezone.

Answer 3

I am using this function.
function currentDate($dateOnly = false, $tillEnd = false)
{
// gmmktime(0, 0, 0, 7, 1, 2000) H i s m d Y
if($dateOnly)
{
if($tillEnd)
{
$t = explode('-',date('Y-m-d'));
return date('Y-m-d',mktime(23, 59, 59, $t[1], $t[2],$t[0]));
}else{
return date('Y-m-d');
}
}else{
if($tillEnd)
{
$t = explode('-',date('Y-m-d'));
return date('Y-m-d H:i:s',mktime(23, 59, 59, $t[1], $t[2],$t[0]));
}else{
return date('Y-m-d H:i:s');
}
}
}
You can call this function to get the time of the system.
Arguments are optional, If you want to get the current date with time then call as
eg:
$currentDatetime=currentDate();

Answer 4

time()
By this you can get time of system
Manual

Answer 5

Try this
<?php
$date = new DateTime(null, new DateTimeZone('Europe/London'));
$tz = $date->getTimezone();
echo $tz->getName();
?>