PHP getdate()在我的代码中的两个不同的地方使用时不返回相同的日期/月

我有一个函数，它调用另一个函数将一些值写入MSSQL数据库。它接受字符串请求作为第一个参数和一个数组，其中包含要在查询中输入的值(哪里有?如果它们包含在变量中并且不能显式地写入查询中，则在查询中。下面是有问题的函数:

public function dbInsert(){
    $curr_date = date('Y-m-d H:i:s');
    $this->db->query("INSERT INTO DAI_REQ.META_REQUEST ".
        "(DATE_RECU, DATE_TERMINEE, USER_ID, STATUS) ".
        "VALUES(?, '', ?, 'R');", array($curr_date, $this->userId));
    $mr_select = $this->db->query("SELECT TOP 1 ID FROM DAI_REQ.META_REQUEST WHERE USER_ID = ? ORDER BY ID DESC;",
            array($this->userId));
    $mr_result = $mr_select->result_array();
    $mr_id = $mr_result[0]['ID'];
    $sim = 'N/A';
    if(isset($this->recurrenceType))
        $sim = 'Recurrent';
    $this->db->query("INSERT INTO DAI_REQ.REQUEST ".
        "(USER_ID, ASSIGNED_DATE, REQUEST_END_DATE, MODEL, EXPERIMENT, VARIABLE, START_DATE, END_DATE, ".
        "LON_FROM, LAT_FROM, LON_TO, LAT_TO, RESOLUTION, FORMAT, SIMULATION, STATUS, ".
        "CANCELLED_YN, PROJECT, MR_ID, URL_ORIGIN, DATE_EMAIL) ".
        "VALUES(?, ?, '', ?, 'N/A', 'N/A', ?, ?, ?, ?, ?, ?, ?, ?, ?, 'R', 0, 'N/A', ?, ?, ?);",
        array($this->userId, $curr_date, $this->model, $this->startDate, $this->endDate, 
                $this->lonFrom, $this->latFrom, $this->lonTo, $this->latTo, 
                $this->resolution, $this->format, $sim, $mr_id, $this->url_origin, $this->date_email));
    $r_select = $this->db->query("SELECT TOP 1 ID FROM DAI_REQ.REQUEST WHERE USER_ID = ? ORDER BY ID DESC;",
            array($this->userId));
    $r_result = $r_select->result_array();
    $this->id = $r_result[0]['ID'];
}

如您所见，我两次调用query函数，在这两个查询中，我使用包含今天日期的变量$curr_date。不幸的是，当我在运行此代码后使用sql-server查看数据库时，我在DAI_REQ.META_REQUEST表中看到的日期与DAI_REQ.REQUEST表中的日期不相同。后者包含正确的日期，而前者包含随机日期(尽管我每天尝试的日期都是相似的)。例如，后者是2014-06-30 14:08:40.427，前者是2014-02-19 00:00:00.000

我还必须提到，我们有两个服务器(所以也有两个数据库)，一个用于开发，一个用于公共部署。我描述的问题发生在公共部署服务器上，而不是在开发服务器上。

我还试图通过直接调用query函数内部的getdate()函数来删除$curr_date变量的使用，如下所示:

$this->db->query("INSERT INTO DAI_REQ.META_REQUEST ".
    "(DATE_RECU, DATE_TERMINEE, USER_ID, STATUS) ".
    "VALUES(GETDATE(), '', ?, 'R');", array($this->userId));
...
$this->db->query("INSERT INTO DAI_REQ.REQUEST ".
    "(USER_ID, ASSIGNED_DATE, REQUEST_END_DATE, MODEL, EXPERIMENT, VARIABLE, START_DATE, END_DATE, ".
    "LON_FROM, LAT_FROM, LON_TO, LAT_TO, RESOLUTION, FORMAT, SIMULATION, STATUS, ".
    "CANCELLED_YN, PROJECT, MR_ID, URL_ORIGIN, DATE_EMAIL) ".
    "VALUES(?, GETDATE(), '', ?, 'N/A', 'N/A', ?, ?, ?, ?, ?, ?, ?, ?, ?, 'R', 0, 'N/A', ?, ?, ?);",
    array($this->userId, $this->model, $this->startDate, $this->endDate, 
            $this->lonFrom, $this->latFrom, $this->lonTo, $this->latTo, 
            $this->resolution, $this->format, $sim, $mr_id, $this->url_origin, $this->date_email));

是什么导致了这种行为?