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PHP Tutorial

PHP: date_sunrise() function

Description

The date_sunrise() function is used to get the time of sunrise for a given day and location.

Version:

(PHP 4 and above)

Syntax:

date_sunrise(timestamp, format, latitude, longitude, zenith, gmt_offset)

Parameters:

Name Description Required /
Optional
OptionalType
timestamp The timestamp of the day. Required Integer
format Sets the format of the output.

Use SUNFUNCS_RET_STRING if you want the output as string (example 16:46)

Use UNFUNCS_RET_DOUBLE if you want the output as float (example 16.78243132)

Use SUNFUNCS_RET_TIMESTAMP if you want the output as integer (example 1095034606)
Optional Float
latitude Indicates the latitude of a location Use a negative value for South. Default is North. Optional Float
longitude Indicates the longitude of a location. Use a negative value for West. Default is East. Optional Float
zenith Solar zenith angle. Optional Float
gmt_offset Difference between GMT and local time in hours. For example, since the difference between GMT and Calcutta-India is five and half hours, therefore for IST, use 5.50. Optional Float

Return value:

The sunrise time in a specified format on success, or FALSE on failure.

Value Type: Mixed*

*Mixed : Mixed indicates multiple (but not necessarily all) types.

Example:

<?php
//Calculate the sunrise time for Kolkata, India
//Latitude: 22.34 North
//Longitude: 88.24 East
//Zenith ~= 45.6177°
//offset: +5.50 GMT
echo("Date: " . date("D M d Y") . "<br />");
echo("Sunrise time: ");
echo(date_sunrise(time(),SUNFUNCS_RET_STRING,22.34,88.24,90.5546,5.50));
?>

Sample Output:

Date: Tue Jan 18 2011
Sunrise time: 06:18

Note: Since sunrise time depends on particular day and location, therefore, the output may vary shown under Output of the example in this tutorial.

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See also

PHP Function Reference

Previous: date_default_ timezone_set
Next: date_sunset



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