autotutorial

yes you are in the right direction, the relative format is the one applied to strtotime or to the class DateTime DateTimeImmutable, remember not to insert a timezone when you have an offset from php 8.0 generates a warning.

Note:

The $timezone parameter and the current timezone are ignored when the $time parameter either is a UNIX timestamp (e.g. @946684800) or specifies a timezone (e.g. 2010-01-28T15:00:00+02:00).

Correct Use for always.

$timezone = wp_timezone();
$my_date = new DateTime( '@' . 1500000000);
$my_date->setTimezone( $timezone ); // force use a un timezone or offset +01:00 , this offset php 5.5.0

// DateTimeImmutable does not change use yours functions,
 this is the correct use see https://www.php.net/manual/en/class.datetimeimmutable.php for all list functions DateImmutable
// I'm DateTimeImmutable and Retrive current date object
// options 1 from PHP 5.5.0
$array = current_datetime();
// $array have Timezone Dashboard settings
$output_date_string = $array->format( 'Y-m-d H:i:s' ); // here YYYY-MM-DD HH:MM:SS

$timezone = wp_timezone(); // Retrive Dashboard timezone from WordPress 5.3
// i'm DateTime
$my_date = new DateTime( $output_date_string, $timezone );
$my_date->modify( 'today midnight' );
echo $my_date->format( 'Y-m-d H:i:s' );

/*
// options 2
$timezone = wp_timezone();
$my_date = new DateTime( 'today midnight', $timezone );
echo $my_date->format( 'Y-m-d H:i:s' );

// options 3
$timezone = wp_timezone();
$my_date = new DateTime( 'now', $timezone ); //php 7.1 microseconds parameter added
$my_date->setTime( 0, 0, 0, 0); // php 7.1 four microseconds parameter added
echo $my-date->format('Y-m-d H:i:s'); // for setTime

//$var->setTimezone( $timezone ); from PHP 5.2.1
*/

Never old PHP functions, strtotime or mktime etc.

the jetpack guide provides a single WordPress example that can use an https or http protocol but for a domain. You can also adapt the regex for multiple domains if covered by your CloudFlare account and / or you use a multisite (I hope without mu plugin) with or without mapping … the construction of a regex means match what has this value.
https://wordpress.org/support/topic/corrupted-plugins/#post-12227823
to check the current status of your certificate enter your site here, it may take 48 hours for DNS propagation, also use the private mode of chrome for debugging.
https://ssllabs.com/ssltest/analyze.html

ok is the correct configuration, you can diagnose if your htaccess rewrites the site.com url (without www prefix) in www.example.com.
It’s definitely a server-side rewrite.
do you also have a DNS record for site.com or just www.site.com ?

Hi, this is a problem with the non-wordprress plugin, go here for assistance.
https://wordpress.org/support/plugin/export-media-with-selected-content/

after backing up, clear each existing cache … cache server cache CDN, cache plugin, not cache browser.
Use the chrome private mode, disability the mu mapping plugin, delete the wp-content/sunrise.php file.
Read above the provided indications I have never used that plugin.
https://wordpress.org/support/topic/broke-sites-idiot-at-work-please-help/#post-12246335
wp-content/uploads/site/ for your PNG, GIF etc.
after creating the secondary site just click on edit and map to your liking, repeat the operation for each secondary site.

if your images for secondary sites are in wp-content/sites/ you started from WordPress 3.5 or higher, in 2019 it is sure that you have definitely started with WordPress 3.5 or higher.
Click on your database name in phpmyadmin you will see a box for a regex, enter the prefix of your current default wordpress é wp_ and the tabs for secondary sites are wp_2 or wp_3 etc.
Have you checked from your current installation?
Sorry my error , check wp_site.
From WordPress 4.5 you can map each secondary site but the network is without mapping.
in wp_blogs you should read your secondary sites two ids, site_id refers to the network

@imrjs https://yourdomain.com/wp-admin/network/setup.php
Refer Mu Domain plugin (settings without plugins) https://wordpress.org/support/topic/howto-domain-mapping-without-a-plugin-instructions/