Editing Convert date time from zulu format

Convert date time from Zulu format ([https://en.wikipedia.org/wiki/ISO_8601 ISO 8601]) or convert date time to Zulu format

== Convert date time from Zulu format ==
Convert date time from T Z format (ISO 8601 format<ref>[https://en.wikipedia.org/wiki/ISO_8601 ISO 8601 - Wikipedia]</ref>; Zulu time format<ref>[https://greenwichmeantime.com/articles/history/zulu/ Zulu Time | GMT]</ref>) e.g. {{kbd |key={{Template:Today}}T10:01:45Z}} or {{kbd |key={{Template:Today}}T22:48:51.660Z}}

=== PHP approach ===
Coordinated Universal Time (UTC)
<pre>
echo date('Y-m-d H:i:s', strtotime('2020-05-08T09:59:08Z')) . PHP_EOL;
// returns 2020-05-08 09:59:08
</pre>

{{exclaim}} The returned result is server timezone dependent if you set the timezone using [https://www.php.net/manual/en/function.date-default-timezone-set.php date_default_timezone_set].
<pre>
date_default_timezone_set("Asia/Taipei");
echo date('Y-m-d H:i:s', strtotime('2020-05-08T09:59:08Z')) . PHP_EOL;
// returns 2020-05-08 17:59:08 
</pre>

=== MySQL approach ===
Coordinated Universal Time (UTC)
<pre>
-- case1: end with decimal & Z
SET @myTime := '2020-05-06T22:48:51.660Z';
SELECT str_to_date(@myTime, '%Y-%m-%dT%H:%i:%s.%fZ');
-- returns 2020-05-06 22:48:51.660000


-- case2: not end with decimal & Z
SET @myTime := '2020-05-08T09:59:08Z';
SELECT str_to_date(@myTime, '%Y-%m-%dT%H:%i:%sZ');
-- returns 2020-05-08 09:59:08

SET @myTime := '2020-05-08T09:59:08Z';
SELECT str_to_date(@myTime, '%Y-%m-%dT%H:%i:%s.%fZ');
-- returns null
</pre>

== Convert date time to Zulu format ==
=== PHP approach ===

<pre>
// 指定時間
$dateTimeString = "2023-04-26 19:01:23";

// 特定時區的 identifier (識別符，例如 UTC+8）
$timeZoneIdentifier = 'Asia/Taipei'; // 'Asia/Taipei' 是 UTC+8 的其中一個時區識別符

// 建立 DateTimeZone 物件，指定時區
$timeZone = new DateTimeZone($timeZoneIdentifier);

// 建立 DateTime 物件，解析日期時間字串，並設置時區
$dateTime = new DateTime($dateTimeString, $timeZone);

// 將 DateTime 物件的時區設置為 UTC
$dateTime->setTimezone(new DateTimeZone('UTC'));

// 格式化日期時間為 Zulu 時間格式並輸出
echo $dateTime->format('Y-m-d\TH:i:s.000\Z');
// 輸出：2023-04-26T11:01:23Z
</pre>

== References ==
<references />

== Further readings ==
* [https://stackoverflow.com/questions/15902464/format-of-2013-04-09t100000z-in-php Format of 2013-04-09T10:00:00Z in php - Stack Overflow]
* [https://stackoverflow.com/questions/44802061/convert-string-to-datetime-in-my-sql mysql - convert string to datetime in my sql - Stack Overflow]
* MySQL [https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_str-to-date STR_TO_DATE(str,format)]
* MySQL [https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_date-format DATE_FORMAT(date,format)]
* PHP [https://www.php.net/manual/en/function.date-default-timezone-set.php PHP: date_default_timezone_set - Manual]

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[[Category:MySQL]]
[[Category:Programming]]
[[Category:Data Science]]
[[Category:Time river]]