A brief analysis of how to convert timestamp into days in php

In PHP, a timestamp is an integer representing the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC. Timestamps are often used to record the time of an event, such as user registration time, order time, etc.

Sometimes we need to convert the timestamp into days for easier calculation and display. Here are two methods to implement the function of converting timestamps into days.

Method 1: Use date function

The date function in PHP is very powerful and can be used for time conversion and formatting.

We can use the date() function in PHP to convert the timestamp into a date, and then use the strtotime() function to calculate the number of seconds that have passed between a certain point in time.

The following is a sample code:

$timestamp = 1633420800; // 2021年10月6日 00:00:00
$days = round((time() - strtotime(date('Y-m-d', $timestamp))) / (60 * 60 * 24));
echo $days; // 输出：0

In the above code, we first define a timestamp variable $timestamp, which represents zero o'clock on October 6, 2021 The complete timestamp. Then use the date() function to format the timestamp into a date string of Y-m-d. Then use the strtotime() function to convert the date string into a timestamp, calculate the difference from the current time, and finally divide the seconds by (60 60 24) to get the number of days.

Note: In order to avoid calculation errors, the round() function is used here to round the number of days to the nearest integer. Also note that the timestamp of the current time should be used when calculating. The output result of the above code should be 0, because it is less than one day before midnight on October 6, 2021.

Method 2: Use the floor function

If we only need to roughly calculate the number of days without converting to date format, we can also use the floor function to directly calculate the number of days corresponding to the timestamp.

Suppose we need to convert 1633420800 into days, the code is as follows:

$timestamp = 1633420800; // 2021年10月6日 00:00:00
$days = floor($timestamp / (60 * 60 * 24));
echo $days; // 输出：18907

In the above code, we directly divide the timestamp by (60 60 24) to get The number of days that have elapsed, and then use the floor function to take the integer part. The calculation result here is 18907, which means that 18907 days have passed.

Summary

This article introduces two methods to convert PHP timestamps into days. In addition, other date processing functions can also be used to complete time conversion and calculation according to specific needs. Mastering the use of timestamp and date functions is very important for PHP development and data analysis.

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