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Q:

PHP date_sunset() function (with example)

Hey everyone,

I am developing a website where I want to display the exact time of sunset for a specific location. I came across the date_sunset() function in PHP, but I am not completely sure how to use it correctly.

Could someone please explain the syntax and parameters of the date_sunset() function? It would be great if you could provide an example as well. I want to understand how to retrieve the sunset time using this function and display it on my website.

Thank you in advance for your help!

All Replies

upton.ken

Hey there,

I've used the date_sunset() function in one of my recent projects, and it's quite handy for displaying the sunset time accurately. Let me share my experience and provide an alternative example for you!

The date_sunset() function in PHP allows you to calculate the time of sunset for a specific date and location. It returns the Unix timestamp of the sunset time, giving you flexibility in further manipulations or formatting according to your needs.

To use the date_sunset() function, you simply need to provide the following parameters:

1. $timestamp: This parameter is optional and represents the Unix timestamp of the desired date and time. If you don't specify it, the current local time will be used as the default.

2. $format: This parameter is also optional and defines the format in which you want to display the sunset time. It follows the same format as the PHP date() function, allowing you to customize the output appearance.

3. $latitude: This parameter is mandatory and indicates the latitude of the location for which you want to calculate the sunset time.

4. $longitude: Similarly, this parameter is mandatory and represents the longitude of the location.

5. $zenith: This optional parameter defines the zenith angle, which determines how the sunset time should be computed. By default, it uses 90° as the zenith angle, representing the "official" horizon.

Now, let me provide you with a different example to give you more options:

php
$date = strtotime('2022-10-01');
$latitude = 37.7749; // Specify the desired latitude, e.g., San Francisco
$longitude = -122.4194; // Specify the desired longitude, e.g., San Francisco
$format = 'h:i A'; // Define a different output format, e.g., 12-hour time with AM/PM

$sunsetTime = date_sunset($date, SUNFUNCS_RET_STRING, $latitude, $longitude, 90);

echo "The sunset time is expected at " . date($format, $sunsetTime) . ".";


In this example, we set a specific date using the strtotime() function. Then, we provide the latitude and longitude for San Francisco, but feel free to replace them with your desired location. Additionally, we modify the format to display a 12-hour time representation, including AM/PM.

Finally, we call date_sunset() with the given parameters and assign the calculated sunset time to the $sunsetTime variable. The output is then echoed using the custom format.

I hope this alternative example helps you better understand the usage of date_sunset() and gives you more ideas for implementing it into your project. Let me know if you need further assistance!

jenifer36

Hey there,

I have actually used the date_sunset() function in one of my projects, so I can definitely help you out with this!

The date_sunset() function in PHP is used to calculate the time of sunset for a specified date and location. It returns the timestamp of the sunset time.

To use the date_sunset() function, you need to provide the following parameters:

1. $timestamp: This parameter is optional and specifies the Unix timestamp of the desired date. If it's not provided, the current local time is used.

2. $format: This parameter is optional as well and specifies the format in which you want to display the sunset time. It follows the same format as the PHP date() function.

3. $latitude: This is the mandatory parameter that represents the latitude of the desired location.

4. $longitude: This is also a mandatory parameter representing the longitude of the desired location.

5. $zenith: This parameter is optional and represents the zenith angle, which is the angle between the vertical and a line connecting the center of the Earth and the center of the celestial body. The default value is 90°, which represents the "official" horizon.

Now, let me provide you with an example to make things clearer:

php
$date = strtotime('2022-10-01'); // Optional: Set a specific date
$latitude = 51.5074; // Specify the latitude of your location, e.g. for London
$longitude = -0.1278; // Specify the longitude of your location, e.g. for London
$format = 'H:i:s'; // Optional: Define the format of the output time

$sunsetTime = date_sunset($date, SUNFUNCS_RET_STRING, $latitude, $longitude, 90); // Calculate and store the sunset time

echo "The sunset time is at " . date($format, $sunsetTime);


In the above example, we first set a specific date using the strtotime() function. Then, we define the latitude and longitude of our desired location. Next, we specify the format in which we want the output time to be displayed.

Finally, we call the date_sunset() function with the provided parameters and store the result in the $sunsetTime variable. We then echo the sunset time using the specified format.

I hope this helps! Let me know if you have any further questions.

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