PHP-将数据从MYSQL提取到JSON时，如何从UTC更改日期时间？

Question

I am pulling some data from a MYSQL database in which I have a date-time that is stored in UTC, then converting everything into JSON. What I need to accomplish is that I want to show this datetime in UTC+3, not UTC.

This is how I am doing everything:

function getValues() {

    $sth = mysql_query($query);
    $rows = array();
    while($r = mysql_fetch_assoc($sth)) {
        $rows['announcements'][] = $r;
    }
    print json_encode($rows);

}

This is the output I get (example):

{
    "announcements":[
        {"id":"1","Title":"Title One","Details":"Detail of One","Submitter":"Alaa Alrufaie","DateSubmitted":"2016-03-06 17:03:48"},
        {"id":"7","Title":"Title Seven","Details":"Detail of Seven","Submitter":"Alaa Alrufaie","DateSubmitted":"2016-03-06 17:23:44"}
    ]
}

How can I output the time in UTC+3 while maintaining this same JSON structure?

Answer 1

You should make the change while reading the database result set:

while($r = mysql_fetch_assoc($sth)) {
    $r['DateSubmitted'] =
        date("Y-m-d H:i:s", strtotime($r['DateSubmitted'].'+3 hours'));
    $rows['announcements'][] = $r;
}

I would however add the time zone information to the date as well, so the consumer of the JSON data knows it is UTC+3. For this you should use the ISO 8601 format , which has a T between date and time, and the additional time zone shift appended as +hh:mm (the colon is optional):

    $r['DateSubmitted'] = 
        date("Y-m-d\TH:i:s+03:00", strtotime($r['DateSubmitted'].'+3 hours'));