book_admin/application/main/helper/DateHelper.php

<?php
/**
 * Created by PhpStorm.
 * User: Bear
 * Date: 2020/4/22
 * Time: 上午11:50
 */

namespace app\main\helper;


class DateHelper
{
    public static function ios_8601()
    {
        $current = microtime(true);
        $micro = '';
        if (strstr($current, '.')) {
            list(, $micro) = explode('.', microtime(true));
        }
        if (strlen($micro) > 3) {
            $micro = substr($micro, 0, 3);
        } else {
            $micro = str_pad($micro, 3, '0');
        }
        return sprintf("%s.%sZ", date('Y-m-d\TH:i:s'), $micro);
    }
}