date_sunrise

Description
Syntax
Examples
Links

Description

The date_sunrise of Date / Time for PHP returns time of sunrise for a given day and location.

Syntax

date_sunrise(
    int $timestamp,
    int $returnFormat = SUNFUNCS_RET_STRING,
    ?float $latitude = null,
    ?float $longitude = null,
    ?float $zenith = null,
    ?float $utcOffset = null
): string|int|float|false

Parameters

timestamp

The timestamp of the day from which the sunrise time is taken.

returnFormat

Constant	Description	Example
SUNFUNCS_RET_STRING	returns the result as string	16:46
SUNFUNCS_RET_DOUBLE	returns the result as float	16.78243132
SUNFUNCS_RET_TIMESTAMP	returns the result as integer (timestamp)	1095034606

latitude

Defaults to North, pass in a negative value for South. See also: default_latitude

longitude

Defaults to East, pass in a negative value for West. See also: default_longitude

zenith

zenith is the angle between the center of the sun and a line perpendicular to earth's surface. It defaults to date.sunrise_zenith

Angle	Description
90°50'	Sunrise: the point where the sun becomes visible.
96°	Civil twilight: conventionally used to signify the start of dawn.
102°	Nautical twilight: the point at which the horizon starts being visible at sea.
108°	Astronomical twilight: the point at which the sun starts being the source of any illumination.

utcOffset

Specified in hours. The utcOffset is ignored, if returnFormat is SUNFUNCS_RET_TIMESTAMP.

Returns the sunrise time in a specified returnFormat on success or false on failure. One potential reason for failure is that the sun does not rise at all, which happens inside the polar circles for part of the year.

Examples

1 · timestamp

<?

$timestamp = time();

$return = date_sunrise($timestamp);

echo $return;

04:24

2 · returnFormat · SUNFUNCS_RET_STRING

<?

$timestamp = time();
$returnFormat = SUNFUNCS_RET_STRING;

$return = date_sunrise($timestamp, $returnFormat);

echo $return;

04:24

3 · returnFormat · SUNFUNCS_RET_DOUBLE

<?

$timestamp = time();
$returnFormat = SUNFUNCS_RET_DOUBLE;

$return = date_sunrise($timestamp, $returnFormat);

echo $return;

4.4142799043149

4 · returnFormat · SUNFUNCS_RET_TIMESTAMP

<?

$timestamp = time();
$returnFormat = SUNFUNCS_RET_TIMESTAMP;

$return = date_sunrise($timestamp, $returnFormat);

echo $return;

1733545491

5 · latitude

<?

$timestamp = time();
$returnFormat = SUNFUNCS_RET_STRING;
$latitude = 44.36;

$return = date_sunrise($timestamp, $returnFormat, $latitude);

echo $return;

04:59

6 · longitude

<?

$timestamp = time();
$returnFormat = SUNFUNCS_RET_STRING;
$latitude = 44.36;
$longitude = -110.30;

$return = date_sunrise($timestamp, $returnFormat, $latitude, $longitude);

echo $return;

14:42

7 · zenith

<?

$timestamp = time();
$returnFormat = SUNFUNCS_RET_STRING;
$latitude = 44.36;
$longitude = -110.30;
$zenith = 90.58;

$return = date_sunrise($timestamp, $returnFormat, $latitude, $longitude, $zenith);

echo $return;

14:44

8 · utcOffset

<?

$timestamp = time();
$returnFormat = SUNFUNCS_RET_STRING;
$latitude = 44.36;
$longitude = -110.30;
$zenith = 90.58;
$utcOffset = 1;

$return = date_sunrise($timestamp, $returnFormat, $latitude, $longitude, $zenith, $utcOffset);

echo $return;

15:44

9 · no sunrise

<?

$timestamp = strtotime("2017-12-21");
$returnFormat = SUNFUNCS_RET_STRING;
$latitude = 69.245833;
$longitude = -53.537222;

$return = date_sunrise($timestamp, $returnFormat, $latitude, $longitude);

var_export($return);

false