How to convert PHP time format to timestamp

PHP is a server-side language that is widely used in web development, especially for handling dates and times. Among them, PHP provides a variety of ways to represent and process date and time. However, in some application scenarios, we may need to convert date and time into timestamps to facilitate calculations and comparisons. This article will introduce how to convert PHP time format to timestamp.

First, let’s take a look at the commonly used date and time formats in PHP:

• Y: Year (four digits)
• y: Year (two digits) number)
• m: month (two digits)
• n: month (without leading zero)
• d: date (two digits)
• j: date (without leading zero)
• H: hour (24-hour format)
• h: hour (12-hour format)
• i: minute
• s: Seconds

Converting date and time into a timestamp is actually very simple, just use the PHP function strtotime() to achieve it. This function converts the given datetime string to a Unix timestamp. For example:

$datetime = '2022-01-01 00:00:00';
$timestamp = strtotime($datetime);
echo $timestamp;

The above code will print out the timestamp 1613988000, indicating the number of seconds from 0:00:00 on January 1, 1970 to 0:00:00 on January 1, 2022 .

Sometimes, we also need to format the timestamp into a specified date and time format. At this time, we can use the PHP function date(). This function converts a Unix timestamp to a datetime string in the specified format. For example:

$timestamp = 1613988000;
$datetime = date('Y-m-d H:i:s', $timestamp);
echo $datetime;

The above code will print out the string 2022-01-01 00:00:00, which represents the date and time corresponding to the Unix timestamp 1613988000.

At the same time, there are some useful PHP functions that can help us operate timestamps. For example, the function time() returns the current Unix timestamp; the function mktime() converts a given datetime parameter into a Unix timestamp. For example:

$current_timestamp = time();
echo $current_timestamp;

$new_year = mktime(0, 0, 0, 1, 1, 2023);
echo $new_year;

The above code will print out the current timestamp and the timestamp corresponding to zero o'clock in the new year of 2023.

In short, PHP provides a wealth of date and time processing functions, including operations such as converting time formats to timestamps. These functions can help us easily process and calculate date and time when developing web applications.

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