How to add number of days to a date in PHP?

Program Example

$Date = "2020-09-19";
echo date('Y-m-d', strtotime($Date. ' + 1 days'));
echo date('Y-m-d', strtotime($Date. ' + 2 days'));

Output

2020-09-18
2020-09-19

Question: How to add number of days to a current date?

echo date('Y-m-d', strtotime("+10 days"));

It would add 10 days to the current date.


Question: How to subtract number of days to a current date?

echo date('Y-m-d', strtotime("-10 days"));

It would subtract 10 days to the current date.


Question: How to add number of days to a on given date?

$date = new DateTime('2016-12-14');
echo date('Y-m-d', ($date->getTimestamp()+ (3600*24*10) )); //3600 = 1 hour

It would add 10 days to the current date.


Question: How to subtract number of days to a given date?

$date = new DateTime('2016-12-14');
echo date('Y-m-d', ($date->getTimestamp()- (3600*24*10) )); //3600 = 1 hour

It would subtract 10 days to the current date.

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