DateInterval::__construct
Creates a new DateInterval object
Description
public DateInterval::__construct
( string $interval_spec
)
Parameters
-
interval_spec
-
An interval specification.
The format starts with the letter P,
for "period."
Each duration period is represented by an integer value
followed by a period designator.
If the duration contains time elements, that portion
of the specification is preceded by the letter
T.
interval_spec Period Designators
| Period Designator |
Description |
| Y |
years |
| M |
months |
| D |
days |
| W |
weeks. These get converted into days,
so can not be combined with D.
|
| H |
hours |
| M |
minutes |
| S |
seconds |
Here are some simple examples.
Two days is P2D.
Two seconds is PT2S.
Six years and five minutes is P6YT5M.
Note:
The unit types must be entered from the largest
scale unit on the left to the smallest scale unit
on the right.
So years before months, months before days,
days before minutes, etc.
Thus one year and four days must be represented as
P1Y4D, not P4D1Y.
The specification can also be represented as a date time.
A sample of one year and four days would be
P0001-00-04T00:00:00.
But the values in this format can not exceed a given period's
roll-over-point (e.g. 25 hours is invalid).
These formats are based on the » ISO 8601 duration
specification.
Errors/Exceptions
Throws an Exception when the interval_spec
cannot be parsed as an interval.
Examples
Example #1 DateInterval example
<?php
$interval = new DateInterval('P2Y4DT6H8M');
var_dump($interval);
?>
The above example will output:
object(DateInterval)#1 (8) {
["y"]=>
int(2)
["m"]=>
int(0)
["d"]=>
int(4)
["h"]=>
int(6)
["i"]=>
int(8)
["s"]=>
int(0)
["invert"]=>
int(0)
["days"]=>
bool(false)
}
See Also
- DateInterval::format
- DateTime::add
- DateTime::sub
- DateTime::diff