DateTimeImmutable::modify
Creates a new object with modified timestamp
&reftitle.description;
#[\NoDiscard]
public DateTimeImmutableDateTimeImmutable::modify
stringmodifier
Creates a new DateTimeImmutable object with modified timestamp.
The original object is not modified.
&reftitle.parameters;
modifier
&date.formats.parameter;
&reftitle.returnvalues;
Returns DateTimeImmutable on success.
&return.falseforfailure.style.procedural;
&reftitle.errors;
If an invalid Date/Time string is passed,
DateMalformedStringException is thrown.
Previous to PHP 8.3, this was a warning.
&reftitle.changelog;
&Version;
&Description;
8.3.0
DateTimeImmutable::modify now throws
DateMalformedStringException if an
invalid string is passed. Previously, it returned false,
and a warning was emitted.
&reftitle.examples;
<function>DateTimeImmutable::modify</function> example
&style.oop;
modify('+1 day');
echo $newDate->format('Y-m-d');
]]>
&example.outputs;
Beware when adding or subtracting months
modify('+1 month');
echo $newDate1->format('Y-m-d') . "\n";
$newDate2 = $newDate1->modify('+1 month');
echo $newDate2->format('Y-m-d') . "\n";
]]>
&example.outputs;
&reftitle.seealso;
DateTimeImmutable::add
DateTimeImmutable::sub
DateTimeImmutable::setDate
DateTimeImmutable::setISODate
DateTimeImmutable::setTime
DateTimeImmutable::setTimestamp