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English
In PHP, strtotime() and date_sunset() are two very useful functions that can help developers handle dates, times, and calculate sunset times. This article will show how to use these two functions to calculate the remaining time between the current time and today's sunset.
The strtotime() function is a function used to parse the date-time description of English text into a Unix timestamp. It accepts a date string and returns a corresponding Unix timestamp.
The date_sunset() function is used to get the sunset time of the specified latitude and longitude. The time it returns is usually given in the form of a Unix timestamp, indicating the sunset moment of the day.
We can combine strtotime() and date_sunset() to calculate the remaining seconds between the current time and today's sunset time. Here is a complete code example:
<?php
// Set the time zone
date_default_timezone_set('Asia/Shanghai');
// Get the current timestamp
$current_time = time();
// Get the time stamp of today's sunset
$latitude = 31.2304; // Beijing's latitude
$longitude = 121.4737; // Longitude in Beijing
$sunset_time = date_sunset($current_time, SUNFUNCS_RET_TIMESTAMP, $latitude, $longitude);
// Calculate the remaining time（Second）
$time_difference = $sunset_time - $current_time;
// Output remaining time
if ($time_difference > 0) {
echo "There is still sunset today " . gmdate("H:i:s", $time_difference) . " Second。";
} else {
echo "Today's sunset time has passed。";
}
?>
Setting the time zone <br> We use date_default_timezone_set('Asia/Shanghai') to make sure the time is calculated according to the correct time zone.
Get the current timestamp <br> Use the time() function to get the Unix timestamp of the current time.
Get the sunset time stamp
The date_sunset() function returns the sunset time of the specified location. By specifying the latitude and longitude (using the latitude and longitude of Beijing here), we can get today's sunset time. The SUNFUNCS_RET_TIMESTAMP parameter tells PHP that it returns a timestamp.
Calculate the time difference <br> We subtract the sunset timestamp with the current timestamp to find out how many seconds there are from now to sunset.
Output remaining time <br> Use gmdate("H:i:s", $time_difference) to format the remaining time, with the output as hours, minutes, and seconds.
The date_sunset() function returns a UTC timestamp, so it is necessary to ensure that the time zone is set correctly to avoid deviations during calculations.
The latitude and longitude in the code should be modified according to where you are, so that you can get the correct sunset time.
By combining strtotime() and date_sunset() , we can easily calculate the remaining time from today's sunset. This method is very suitable for applications that require tasks to be performed according to sunset time, such as weather applications, schedule management tools, etc.
