My Form has 2 fields - Time_from and Time_to
Now i need to add an entry in my database for each day (If theres is a difference between those days) ex. Time_from = 20
you can use Add function of Datatime object
here i am giving you one example to add one 1 in your post date like
<?php
$date = new DateTime('2000-01-01');
$date->add(new DateInterval('P1D'));
echo $date->format('Y-m-d') . "\n";
?>
OUTPUT
2000-01-02
Hope it will sure help you to solve your issue.
$date = new DateTime('2017-01-17');
$date->modify('+1 day');
echo $date->format('Y-m-d'); // 2017-01-18
You can do it too:
$dateTo = new \DateTime('1980-12-07 +1 day');
echo $dateTo->format('Y-m-d'); // 1980-12-08