(PHP 5 >= 5.3.0, PHP 7, PHP 8)
DateTime::add -- date_add — Modifies a DateTime object, with added amount of days, months, years, hours, minutes and seconds
Object-oriented style
Procedural style
Adds the specified DateInterval object to the specified DateTime object.
Like DateTimeImmutable::add() but works with DateTime.
The procedural version takes the DateTime object as its first argument.
objectProcedural style only: A DateTime object returned by date_create(). The function modifies this object.
interval
A DateInterval object
Returns the modified DateTime object for method chaining.