How to convert timestamp to readable time format in Php

PHP is a programming language widely used in Web development. It supports the conversion and operation of time. A timestamp is an integer value representing a period of time, which is the number of seconds since January 1, 1970 00:00:00 GMT. In PHP we can easily convert time to timestamp or timestamp to readable time format.

1. Convert time to timestamp

In PHP, we can use the time() function to get the current timestamp, for example:

$time = time();
echo $time;

The output result is the current The number of seconds since 00:00:00 on January 1, 1970. If you want to convert a specified time into a timestamp, you can use the strtotime() function. For example:

$timeStr = "2021-08-20 08:30:00";
$timeStamp = strtotime($timeStr);
echo $timeStamp;

In this example, we convert the string "2021-08-20 08:30:00" into a timestamp. The output result is 1629455400, which is the number of seconds from 00:00:00 on January 1, 1970.

2. Convert the timestamp into a readable time format

To convert the timestamp into a readable time format, you can use the date() function. For example:

$timeStamp = 1629455400;
$timeStr = date("Y-m-d H:i:s", $timeStamp);
echo $timeStr;

In this example, we convert the timestamp 1629455400 into the date string "2021-08-20 08:30:00". The first parameter of the date() function is the date format to be output, and the second parameter is the timestamp to be converted. The output result is "2021-08-20 08:30:00".

In the date() function, you can use different formatting characters to obtain different time information. For example:

$timeStamp = 1629455400;
$timeStr = date("Y-m-d", $timeStamp);
echo $timeStr;

In this example, we convert the timestamp 1629455400 into the date string "2021-08-20". The output result is "2021-08-20".

The following are some commonly used formatting characters:

• Y: The complete year represented by 4 digits (for example: 2021)
• m: Represented by 2 digits month (for example: 08)
• d: date represented by 2 digits (for example: 20)
• H: hour in 24-hour format (for example: 08)
• i: Number of minutes (for example: 30)
• s: Number of seconds (for example: 00)

3. Consider the impact of time zone

When using PHP processing time, the impact of time zone needs to be considered. The system time zone can be set using the date_default_timezone_set() function, for example:

date_default_timezone_set('Asia/Shanghai');

In this example, we set the system time zone to Asia/Shanghai time zone. After setting the time zone, when getting the current timestamp and converting the time string to a timestamp, the resulting time will be based on that time zone.

4. Summary

PHP provides a wealth of functions to handle time and timestamps. We can use the time() function to get the current timestamp, the strtotime() function to convert the time string into a timestamp, and the date() function to convert the timestamp into a readable time format. When dealing with time, you need to consider the impact of time zones.

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