How to use now in mysql

The NOW() function is a timestamp function in MySQL that returns the current system time and date. Its usage is NOW([format]), where format specifies the time format, and the default is YYYY-MM-DD HH:MM:SS. The returned time can be specified in ISO 8601 format, date format, or time format. The NOW() function returns the server time. The accuracy is affected by the server clock resolution and should be used with caution when comparing timestamps.

Detailed explanation of the NOW() function in MySQL

What is the NOW() function?

The NOW() function is a MySQL function that returns the current system time and date.

Usage of NOW() function

NOW() function can be used according to the following syntax:

NOW([format])

Where:

• format(optional): Specify the time format. If no format is specified, a timestamp in the formatYYYY-MM-DD HH:MM:SSis returned.

Detailed Description

The NOW() function returns the current time, which is based on the server's host computer clock. It is a volatile function, which means it returns a new value every time it is called.

Date format

The time format returned by the NOW() function can be specified as one of the following values:

• %Y -%m-%d %H:%M:%S: ISO 8601 format
• %Y-%m-%d: Date format
• %H:%M:%S: Time format

If no date format is specified, the NOW() function will returnYYYY-MM-DD HH:MM:SSformat value.

Example

SELECT NOW();

Output:

2023-03-08 14:30:01

SELECT NOW('%Y-%m-%d');

Output:

2023-03-08

Notes

• NOW() function returns server time, not client time.
• The accuracy of the NOW() function depends on the resolution of the server clock.
• Because the NOW() function is volatile, it should be used with caution when comparing timestamps.

The above is the detailed content of How to use now in mysql. For more information, please follow other related articles on the PHP Chinese website!