Teach you the most detailed way to convert PHP timestamp to date and time

In the previous article, I brought you "How to format time and date in PHP? How to calculate the time difference? 》, which introduces in detail how to format the time and date in PHP and how to calculate the time difference. In this article, let’s take a look at the mutual conversion of dates and timestamps. I hope it will be helpful to everyone!

In the previous article ("Summary of methods to obtain time in PHP (detailed examples)") we introduced how to obtain time, that is Timestamp, so how can we complete the conversion between timestamp and date and time in PHP?

Convert date and time to timestamp

We can use the time() function to Get the timestamp, but the time() function can only get the timestamp of the current time in different time zones. The example is as follows:

<?php
    $time = time();
    echo &#39;当前的时间戳为：&#39;.$time.&#39;<br>&#39;;
?>

Output result:

When we want to convert a specific time into a timestamp, how should we do it? At this time we can use the strtotime() function to achieve this.

• <span style="font-size: 16px;">##strtotime()<strong></strong></span>Function

strtotime() function can convert any string date described in English text into a UNIX timestamp. Its syntax format is as follows:

strtotime(字符串形式的时间 [,用来计算返回值的参数])

The example is as follows:

<?php
    echo time().&#39;<br>&#39;;//当前时间的时间戳
    echo strtotime(&#39;now&#39;).&#39;<br>&#39;;//使用now获取的时间戳，也就是当前时间戳
    echo strtotime("1 September 2021").&#39;<br>&#39;;//2021年九月一日的时间戳
    echo strtotime("+1 day").&#39;<br>&#39;;//当前时间加上一天的时间戳
    echo strtotime("+1 week 1 days 1 hours 1 seconds").&#39;<br>&#39;;//当前时间加上一周一天一小时一秒的时间戳
    echo strtotime("next Thursday").&#39;<br>&#39;;//下周四的时间戳
    echo strtotime("last Monday").&#39;<br>&#39;;//上周一的时间戳
?>

Output result:

#As can be seen from the above example, the problem of transferring a specific time to a timestamp is achieved through the strtotime function. Next, Introducing a more intuitive function that can convert a specific time into a timestamp.

• ##mktime()<span style="font-size: 16px;"><strong></strong></span>Function

The mktime() function can return the timestamp of the specified time and is more intuitive than the strtotime function. Its syntax format is as follows:

mktime(指定时间时,指定时间分,指定时间秒,指定时间月,指定时间日,指定时间年)

The example is as follows:

<?php
echo &#39;当前的时间戳是：&#39;.mktime();  // 没有设置参数则默认取得当前GMT时间
?>

Output result:

Obtain the UNIX timestamp of 15:00:00 on October 21, 2021 at the specified time. The example is as follows:

<?php
echo &#39;2021年10月21日15点0分0秒的时间戳是：&#39;.mktime(15,0,0,10,21,2021);  //设置参数表示GMT时间2021年10月21日15点0分0秒
?>

Output result:

From the above example, the time and date can also be converted into a timestamp through the mktime function.

The functions and methods introduced above are all used to convert dates into timestamps. Next, let’s take a look at how timestamps are converted into the time and date we are used to.

Time stamp conversion to date and time
Converting timestamp to date and time requires the use of

date()

Function, this function is used to format time and date. The formatting process can actually be regarded as a conversion process. The syntax format of the date() function is as follows: <pre class='brush:php;toolbar:false;'>date(转化后的时间格式,转化前的时间戳)</pre>There are many converted time formats. Let me list some for you first:

H

---Use The 24-hour format represents the number of hours, zero 00 to 23

m

---Use two digits to represent the current month 01 to 12

d

---Indicates the day of the month, it should be expressed with two digits. If it is less than two digits, add a 0 in front.

Y

---Use 4 digits to represent the complete year

s

---Use two digits to represent seconds, zero 00 To 59
i
---Use two digits to represent minutes, zero 00 to 59 Next, let’s experiment with the timestamp of 1634799600, this time The stamp is the timestamp of 15:00:00 on October 21, 2021 in the previous example.

The example is as follows:

<?php
echo &#39;1634799600转化为日期时间的年份为：&#39;,date(&#39;Y&#39;, 1634799600),&#39;<br/>&#39;;
echo &#39;1634799600转化为日期时间的月份为：&#39;,date(&#39;m&#39;, 1634799600),&#39;<br/>&#39;;
echo &#39;1634799600转化为日期时间的月内天数为：&#39;,date(&#39;d&#39;, 1634799600),&#39;<br/>&#39;;
echo &#39;1634799600转化为日期时间的小时数为：&#39;,date(&#39;H&#39;, 1634799600),&#39;<br/>&#39;;
echo &#39;1634799600转化为日期时间的小时内分钟数为：&#39;,date(&#39;i&#39;, 1634799600),&#39;<br/>&#39;;
echo &#39;1634799600转化为日期时间的分钟内秒数为：&#39;,date(&#39;s&#39;, 1634799600),&#39;<br/>&#39;;
?>

Output result:

It can be seen that the normal date and time can be output through the date function , but it still does not conform to our daily habits. We only need to combine the parameters together. The example is as follows:

<?php
echo &#39;1634799600转化为日期时间为：&#39;,date(&#39;Y-m-d H:i:s&#39;, 1634799600);
?>

Output result:

From this we have completed the conversion of timestamp to date and time.

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