Refinement: the most viewed material of the week and month?

Question

DLE

Dear masters!
I ask for your help in writing a hack to display: The most viewed material for the week and month.
For the current day - the hack is already successfully displaying posts.
But here's the problem, how to write in the file: engine/modules/cron.php
after:
if( $cron == 2 ) {
insert (this will reset the daily counter):

$db->query( "UPDATE " . PREFIX . "_post_extras SET day_read=0" );

How to change this line (and add another condition for the month):

$db->query( "UPDATE " . PREFIX . "_post_extras SET day_read=0" );

so that the Cron file resets the counter every week and, accordingly, one more condition for resetting for the month?
Please help with advice, everything else seems to be as it is.