What are the date and time processing methods in PHP7.0?

With the continuous development of computer technology, we can already complete many traditional manual tasks on computers. For example, date and time processing may have previously required manual calculations. Now, we can use computer languages ​​to solve this problem in a very short time. PHP is a mainstream server-side scripting language that has many advantages such as open source, cross-platform, and easy to learn. In PHP version 7.0, date and time processing has been well upgraded and has received widespread attention. This article will introduce date and time processing methods in PHP7.0.

1. Set time zone

In PHP, time zone is a very important concept. We have to set a default time zone to get the current date and time or convert the date and time to the format we need. The time zone can be set using the following code:

date_default_timezone_set('Asia/Shanghai');

The above code sets the time zone to Asia Shanghai On Time, we can change the time zone as needed.

2. Get the current date and time

In PHP 7.0, without setting a specific date and time, you can use the following code to get the current date and time:

echo date('Y-m-d H:i:s');

The above code will output the current time in the format of "year-month-day hour:minute:second" (for example: 2022-05-03 15:22:10).

3. Convert time to timestamp

In PHP, you can use the strtotime() function to convert a specific date or time to a UNIX timestamp (The number of seconds since 00:00:00 on January 1, 1970). Here is an example:

echo strtotime('2022-05-03');

The above code will output "1651574400", which is the UNIX timestamp of May 3, 2022.

4. Convert timestamp to time format

Use the following code to convert timestamp back to visual time format:

echo date('Y-m-d H:i:s', strtotime('2022-05-03 22:33:44'));

The above code will output " 2022-05-03 22:33:44", that is, convert the UNIX timestamp into visual time format.

5. Format date and time

You can use the date() function to format the date and time into any format. The following are some commonly used date and time formats:

• "Y-m-d": year-month-day (for example: 2022-05-03)
• "Y/m/d": Year/month/day (for example: 2022/05/03)
• "m-d-Y": month-day-year (for example: 05-03-2022)
• "m/d/Y ": month/day/year (for example: 05/03/2022)
• "H:i:s": hour: minute: second (for example: 15:22:10)
• "h:i:s A": hour:minute:second AM/PM (for example: 03:22:10 PM)

Here are some examples:

echo date('Y/m/d', strtotime('2022-05-03'));
echo date('H:i:s', strtotime('2022-05-03 22:33:44'));
echo date('h:i:s A', strtotime('2022-05-03 22:33:44'));

6. Handling future or past date and time

You can use the following code to process future or past date and time. For example, the following code adds 7 days to the current date:

echo date('Y/m/d', strtotime("+7 day"));

If you want to add 3 hours to the current time:

echo date('H:i:s', strtotime("+3 hour"));

Conversely, if you want to subtract 7 days or 3 hours:

echo date('Y/m/d', strtotime("-7 day"));
echo date('H:i:s', strtotime("-3 hour"));

The above are some date and time processing methods in PHP7.0. These methods can help us handle dates and times more efficiently in web development.

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