How to change date format in Joomla 3.x?

Question

Joomla

How to change date format in Joomla 3.x?
On the main page, the date format is %Y-%m-%d %H:%M:%S
and on the remaining pages %d.%m.%Y %H:%M:%S
In the files ru_RU.ini b en_GB.ini there are no such formats.
The files that are responsible for the output of template/html materials also do not have such formats.
In the redefinition of constants, I changed the DATE_FORMAT_LC3 format and changed the date type for all pages except the main one.
Where to change for the main I can not find.
Where to look from where exactly pulls up the format? Or how it is possible to redefine for each separate page?

Answer 1

Redefined the date in the line that displays the date <?php echo JHtml::_('date', $item->created, 'dmY H:i'); ?>
Everything worked