Hello world!

From WordPress settings:
Offset: 2
Timezone string: Europe/Helsinki
Date format: j.n.Y

UTC - date_i18n( $timezone_format, false, true ): 2019-12-16 03:30:01
EET - date_i18n( $timezone_format ): 2019-12-16 05:30:01

WordPress version is 5.3.1

WordPress 5.3 new date/time functions:
wp_timezone_string(): Europe/Helsinki
time(): 1576467001
date(): 2019-12-16T03:30:01+00:00
date(): 2019-12-16 03:30:01
wp_date() localized: 2019-12-16T05:30:01+02:00
wp_date() localized: 2019-12-16 05:30:01
wp_date() localized, WP date_format: 16.12.2019