php - 另一个日期时间问题

Question

我目前有一个这种格式的日期

2010-03-03 10:39:18

这是 MySQL 中的一个 TIMESTAMP 字段。对于名为 Solr 的搜索引擎，我需要这种格式的日期:

1995-12-31T23:59:59Z

这是他们网站上关于日期的一些文字:

Solr expects dates to be in UTC when indexing. The format for this date field is of the form 1995-12-31T23:59:59Z, and is a more restricted form of the canonical representation of dateTime http://www.w3.org/TR/xmlschema-2/#dateTime. The trailing "Z" designates UTC time and is mandatory. Optional fractional seconds are allowed: 1995-12-31T23:59:59.999Z All other components are mandatory.

SO 上的另一个 Q 给了我这段代码，但它不起作用。 Solr 提示“无效的时间字符串”:

$solr_date = date('c', (strtotime($date_from_mysql)); // doesn't work

回显 $solr_date 时， 上面提到的尾随 Z 不存在。谢谢。

Answer 1

为什么不直接将其转换为 UTC？

    $datetime = "2010-01-19 00:00:00";
    echo "Datetime Before: ".$datetime."<br />";
    $dttostr = strtotime("2010-01-19 00:00:00");
    echo "Datetime After: ".formatToUTC($dttostr)."<br />";
    echo "System Timezone: ".date_default_timezone_get()."<br />";

    function formatToUTC($passeddt) {
        // Get the default timezone
        $default_tz = date_default_timezone_get();

        // Set timezone to UTC
        date_default_timezone_set("UTC");

        // convert datetime into UTC
        $utc_format = date("Y-m-d\TG:i:s\Z", $passeddt);

        // Might not need to set back to the default but did just in case
        date_default_timezone_set($default_tz);

        return $utc_format;
    }