How to convert year, month and day to timestamp in php? Two methods are introduced

In PHP, converting year, month and day into timestamp is a common task, because in many practical applications we need to convert date data into timestamp for calculation or time formatted output.

PHP provides two methods to convert year, month and day into timestamps, using the strtotime() function and the DateTime::createFromFormat() method.

Method 1: Use the strtotime() function

The strtotime() function is a very convenient and widely used PHP function that can convert a string date and time into a timestamp. The following is an example code that uses the strtotime() function to convert the year, month and day into a timestamp:

$dateString = '2021-08-06';
$timestamp = strtotime($dateString);
echo $timestamp;

Output result:

1628208000

The above code first defines a year, month and day string $dateString, Then it is converted into a timestamp $timestamp through the strtotime() function, and finally the timestamp value is output.

It should be noted that the strtotime() function only supports accepting English date formats, so if you need to convert a date and time string into a timestamp, you need to write the English abbreviation or full name of the date or month correctly. . For example, Jan is January and Feb is February.

Method 2: Use the DateTime::createFromFormat() method

DateTime::createFromFormat() is a class method in PHP that can parse a string date and time into a date object. The following is a sample code that uses the DateTime::createFromFormat() method to convert the year, month and day into a timestamp:

$dateString = '2021-08-06';
$dateTimeObject = DateTime::createFromFormat('Y-m-d', $dateString);
$timestamp = $dateTimeObject->getTimestamp();
echo $timestamp;

Output result:

1628208000

The above code first defines a year, month and day string $dateString, and then convert it to a date object $dateTimeObject through the DateTime::createFromFormat() method, then call the $dateTimeObject->getTimestamp() method to get the timestamp $timestamp, and finally output the timestamp value.

It should be noted that the DateTime::createFromFormat() method needs to pass in two parameters. The first parameter is the date time string date format, and the second parameter is the date time string. If you pass in The date and time string format does not match the specified date format, then this method will return false.

Using the above two methods, you can easily convert the year, month and day into a timestamp, and then calculate the date data or format the time for output.

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