How to use strtotime function in php to convert date format to timestamp

Converting date format to timestamp is an operation often used in PHP programming. On many occasions, we need to convert date formats into Unix timestamps for calculation, comparison, and processing in programs.

In PHP, we can use the strtotime function to convert the date format into a timestamp (Unix timestamp). In this article, we will introduce in detail how to use the strtotime function to convert dates in various formats into timestamps.

1. Convert the date in "yyyy-MM-dd" format into a timestamp

$date = '2021-07-08';
$timestamp = strtotime($date );
echo $timestamp;

This code will output the Unix timestamp, which represents the timestamp of 0:00:00 on July 8, 2021.

2. Convert the date format "yyyy-MM-dd HH:mm:ss" with time information into a timestamp

$date = '2021-07-08 13:45 :32';
$timestamp = strtotime($date);
echo $timestamp;

This code will output the Unix timestamp, which means 13:45 on July 8, 2021 32 second timestamp.

3. Convert other date formats into timestamps

Except the two common date formats "yyyy-MM-dd" and "yyyy-MM-dd HH:mm:ss" In addition, there are some other date formats that need to be converted into timestamps. Below we introduce how to convert these date formats into timestamps.

(1) Convert the date in "yyyy/MM/dd" format into a timestamp

$date = '2021/07/08';
$timestamp = strtotime(str_replace ('/', '-', $date));
echo $timestamp;

In this code, we replace "/" with "-", and then use the strtotime function to Convert date format to timestamp.

(2) Convert the date in "dd-MMM-yyyy" format into a timestamp

$date = '08-Jul-2021';
$timestamp = strtotime(str_replace ('-', ' ', $date));
echo $timestamp;

In this code, we replace "-" with a space, and then use the strtotime function to convert the date format is the timestamp.

(3) Convert the day of the week in English format into a timestamp

$date = 'Thursday';
$timestamp = strtotime($date);
echo $timestamp ;

In this code, we directly use the strtotime function to convert the day of the week into a timestamp. The timestamp output represents the timestamp corresponding to the Thursday closest to the current time.

Summary

Converting date format to timestamp is a common operation in many PHP programming, and the strtotime function is the main tool for this operation. Among the above different date formats, we can see that we only need to convert the specific date format into the format of "yyyy-MM-dd" or "yyyy-MM-dd HH:mm:ss", and then use strtotime Function can easily convert date format into timestamp.

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