date_sunrise
date_time_set
Date/Time Functions
PHP Manual

# date_sunset

(PHP 5)

date_sunset — Returns time of sunset for a given day and location

### Description

mixed date_sunset ( int `$timestamp` [, int `$format` [, float `$latitude` [, float `$longitude` [, float `$zenith` [, float `$gmt_offset` ]]]]] )

date_sunset() returns the sunset time for a given day (specified as a `timestamp` ) and location.

### Parameters

`timestamp`

  The `timestamp` of the day from which the sunset time is taken.

`format`

  `format` constants
  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: date.default_latitude

`longitude`

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

`zenith`

  Default: date.sunrise_zenith

`gmtoffset`

  Specified in hours.

### Errors/Exceptions

Every call to a date/time function will generate a `E_NOTICE` if the time zone is not valid, and/or a `E_STRICT` message if using the system settings or the TZ environment variable. See also date_default_timezone_set()

### ChangeLog

Version | Description
--- | ---
5.1.0 | Now issues the `E_STRICT` and `E_NOTICE` time zone errors.

### Return Values

Returns the sunset time in a specified `format` on success, or `FALSE` on failure.

### Examples

Example #1 date_sunset() example

`<?php
/* calculate the sunset time for Lisbon, Portugal
Latitude: 38.4 North
Longitude: 9 West
Zenith ~= 90
offset: +1 GMT
*/
echo date("D M d Y"). ', sunset time : ' .date_sunset(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);
?>`

The above example will output something similar to:

    Mon Dec 20 2004, sunset time : 18:13

### See Also

- date_sunrise()

date_sunrise
date_time_set
Date/Time Functions
PHP Manual