How to achieve difference in php timestamp

PHP Timestamp Difference - Master Common Timestamp Functions

Timestamp is a counting method used to represent date and time. In PHP, a timestamp refers to the total number of seconds since 0:00:00 on January 1, 1970 to the current time. Since timestamps are a universal time representation method, PHP provides us with a series of functions to easily apply them. One of the applications is to find the time difference between two dates, which is used in many practical developments.

Next, let’s take a look at the common functions for calculating timestamp differences in PHP.

1. time() function

The time() function is used to obtain the current timestamp. It does not require any parameters, just call it directly.

Sample code:

$now = time();
echo $now;  // 输出当前时间戳

2. strtotime() function

The strtotime() function converts a date represented in human-readable format into a timestamp The function. It accepts a date string parameter and returns the corresponding timestamp. If the parameter is invalid, false is returned.

Sample code:

$timestamp = strtotime('2022-01-01');
echo $timestamp;   // 输出2022年1月1日的时间戳

3. mktime() function

The mktime() function is used to obtain the timestamp of a given date and time. It needs to accept a date and time string containing at least 3 parameters, in order: hours, minutes, and seconds. You can also include a fourth parameter for the month and a fifth parameter for the year.

Sample code:

$timestamp = mktime(21, 45, 0, 10, 24, 2021);
echo $timestamp;  // 输出指定日期时间的时间戳

4. date_diff() function

date_diff() function is used to calculate the difference between two dates. It accepts two date object parameters and returns a DateInterval object, which contains the difference between the two date times. Note: The parameter type must be a DateTime object or datetime string format.

Sample code:

$date1 = new DateTime('2021-10-01');
$date2 = new DateTime('2022-01-01');

$interval = date_diff($date1, $date2);
echo $interval->format('%R%a days');  // 输出两个日期之间的天数差值

5. strtotime() and date() functions are used together

strtotime() and date() functions are used together to facilitate Calculate the difference between dates. The basic idea is to first convert the date string into a timestamp, and then format the timestamp into the required time format.

Sample code:

$diff = strtotime('2022-01-01') - strtotime('2021-10-01');
echo '相差'.floor($diff/(60*60*24)).'天';   // 输出相差的天数

In the above method, first use the strtotime() function to convert the two date strings into timestamps, find the difference between them, and then use floor() ) function rounds down to get the number of days.

Summary

The above are several common functions and methods for PHP timestamp difference. Mastering these functions and methods will be very helpful for daily date and time calculation and development practices. When using these functions, you need to pay attention to the type and format of the parameters to avoid incorrect results.

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