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(PHP 5)

date_sunrise --  Returns time of sunrise for a given day and location

Description

mixed date_sunrise ( int timestamp [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]] )

date_sunrise() returns the sunrise time for a given day (specified as a timestamp ) and location. The latitude , longitude and zenith parameters default to the date.default_latitude , date.default_longitude and date.sunrise_zenith configuration options, respectively.

The latitude defaults to North. So, if you want to specify a South value, you must pass a negative value. The same note applies to longitude , which defaults to East.

The gmt_offset parameter is specified in hours.

Table 1. format constants

constant description example SUNFUNCS_RET_STRING returns the sunset time as string 16:46 SUNFUNCS_RET_DOUBLE returns the result as float 16.78243132 SUNFUNCS_RET_TIMESTAMP returns the sunset time as an integer (timestamp) 1095034606

Example 1. date_sunrise() example

<?php

/* calculate the sunrise time for Lisbon, Portugal
Latitude: 38.4 North
Longitude: 9 West
Zenith ~= 90
offset: +1 GMT
*/

echo date("D M d Y"). ', sunrise time : ' .date_sunrise(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);

?>

The above example will output something similar to:

Mon Dec 20 2004, sunrise time : 08:54

Related Function(s)

date_sunset()