Hi,
it's a maketime joke 😃
This stupid function want Month before day...
int mktime ( int hour, int minute, int second, int month, int day, int year [, int is_dst])
try this, instead
$time=mktime(12,0,0,1,13,date("Y"));
$endtime=mktime(10,0,0,1,14,date("Y"));
see you